Two new species of Dolichurus Latreille (Hymenoptera, Ampulicidae) from China, with a key to species of the genus

331 Two new species of Dolichurus Latreille (Hymenoptera, Ampulicidae) from China, with a key to species of the genus Xuemei Bai1, Li Ma1, Guowen Tang1, Qiang Li1 1 Department of Entomology, College of Plant Protection, Yunnan Agricultural University, Kunming, Yunnan, 650201, China Corresponding authors: Guowen Tang ([email protected]); Qiang Li ([email protected]) Copyright: © Xuemei Bai et al. This is an open access article distributed under terms of the Creative Commons Attribution License (Attribution 4.0 International – CC BY 4.0). Research Article Abstract Two new species of Dolichurus Latreille, 1809, namely D. albipedigerus Bai & Li, sp. nov. and D. nigrilamellatus Bai & Li, sp. nov. are described from China (Yunnan, Guangdong and Jiangxi Provinces). Dolichurus albipedigerus Bai & Li, sp. nov. is similar to D. apiciornatus Tsuneki, 1977, but differs in having the mandible ivory white medially, the clypeus with a weak median carina, and the body with ivory-white spots. Dolichurus nigrilamellatus Bai & Li, sp. nov. is similar to D. aposanus Tsuneki et al., 1992, but differs in having the frons with dense rugae converging toward the midline above the lamella, the sternaulus conspicuous, and the posterior margin of T1-T3 without tiny puncture-rows medially. Additionally, a key to the Chinese species of Dolichurus is provided. Key words: Cockroach wasps, Dolichurinae, Dolichurus, key, sphecid wasps, taxonomy Introduction Wasps of the genus Dolichurus Latreille, 1809 are small sphecids that use cockroaches as prey for larvae, commonly called cockroach wasps. Dolichurus belongs to Ampulicidae, Dolichurini, and is the largest genus in the tribe Dolichurini. Latreille (1809) erected Dolichurus without including any species, and later (1810) designated D. corniculus (Spinola, 1808) as the type species of the genus (Latreille 1809, 1810). At present, Dolichurus comprises 54 species and two subspecies worldwide, mainly found in the Oriental, Palearctic and Ethiopian regions, with fewer species occurring in the Nearctic, Neotropical and Australo-Papuan regions. Fifteen species occur in the Palearctic region, 29 species and one subspecies in the Oriental, two species in the Nearctic, 13 species and one subspecies in the Ethiopian, three species in the Neotropical, and four species in the Australo-Papuan; eight species are shared between the Palearctic and Oriental, two species are shared between the Palearctic and Ethiopian, and one species is shared between the Nearctic and Neotropical regions (F. Smith 1869, Arnold 1928, Arnold 1952, Tsuneki 1967, Nagy 1971, Tsuneki 1972, Tsuneki 1977, Krombein 1979, Tsuneki 1992, Tsuneki et al. 1992, Ohl 2011, Girish Kumar and Sheikh 2018, Anagha et al. 2020, Pulawski 2025). Currently, 12 species are known in China (Pu 1986, Wu et al. 2003, Hua 2006, Pulawski 2025). Academic editor: Thorleif Dörfel Received: 3 June 2025 Accepted: 3 September 2025 Published: 3 October 2025 ZooBank: https://zoobank.org/ A54E9D5F-0A63-4C73-93CDAF324CD953B8 Citation: Bai X, Ma L, Tang G, Li Q (2025) Two new species of Dolichurus Latreille (Hymenoptera, Ampulicidae) from China, with a key to species of the genus. ZooKeys 1254: 331–345. https://doi.org/10.3897/ zookeys.1254.161007 ZooKeys 1254: 331–345 (2025) DOI: 10.3897/zookeys.1254.161007 332 ZooKeys 1254: 331–345 (2025), DOI: 10.3897/zookeys.1254.161007 Xuemei Bai et al.: Two new species of Dolichurus from China In the distant past, China was influenced by geologic events such as continental drift and the accelerated uplift of the Tibetan Plateau. These processes have not only shaped current distribution patterns, unique landscapes and landforms, and geographical barriers, but also promoted rapid differentiation of organisms, thereby enriching biodiversity. China is situated in the southeastern part of Eurasia, straddling the Oriental and Palearctic regions. Moreover, China had complex and diverse landform patterns and climatic environments, which provided a rich variety of habitat types for insects, forming both widespread and endemic species. Rich biodiversity is conducive to the multiplication and thriving of cockroach wasps (Almeida et al. 2012; Da Silva and Noll 2015; Trewick 2017). In this study, two new species, D. albipedigerus Bai & Li, sp. nov. and D. nigrilamellatus Bai & Li, sp. nov. were discovered and described in detail, including a differential diagnosis with their nearest species, a key to known species in China, and photographs of the two new species. Material and methods The specimens examined are deposited in Yunnan Agricultural University, Kunming, China (YNAU). Specimens were photographed using a stereomicroscope (Keyence VHX-S5500E) equipped with a digital microscopic system. Plates were processed with Adobe Photoshop® 2020 software. For the terminology, we mainly follow Bohart and Menke (1976). The abbreviations are as follows: HW head width (dorsal view, maximum) HL head length (frontal view, distance from vertex to margin of clypeus in the middle) POD post-ocellar distance (dorsal view, distance between inner margins of hind ocellus) OD ocellus distance (dorsal view, minimum distance between inner and outer margin of ocellus) OOD ocellocular distance (dorsal view, distance between outer margin of hind ocellus and nearest inner orbit) IODv minimum interocular distance in vertex (frontal view) IODc minimum interocular distance in clypeus (frontal view) A antenna aW antennal apical width bW antennal basal width T gastral tergum (dorsal view) S gastral sternum (ventral view) LT maximum length of gastral tergum (dorsal view) WT maximum width of gastral tergum (dorsal view) Result Dolichurus Latreille, 1809 Dolichurus Latreille, 1809: 387. Type species: Pompilus corniculus Spinola, 1808, designated by Latreille, 1810: 438. 333 ZooKeys 1254: 331–345 (2025), DOI: 10.3897/zookeys.1254.161007 Xuemei Bai et al.: Two new species of Dolichurus from China Thyreosphex Ashmead, 1904: 282. Type species: Thyreosphex stantoni Ashmead, 1904, by monotypy. Diagnosis. Medium to small wasps, 5–13 mm. Black, terminal gastral segments sometimes red; whitish marks on mandible, clypeus, frontal platform, pronotal tubercle, tegula, and leg. Inner margin of mandible with teeth. Clypeus median carina often present. Antenna filiform, slender and long; 12 segments in female, 13 segments in male; antennal sockets nearly contiguous, covered by U-shaped lamella. Frontal line usually indicated, but weak and intermittent; vertex arched above eyes; maxillary palpi slender, labial palpi short and stout; thorax covered with silvery pubescence, pronotal collar shorter than scutum; scutum notauli conspicuous and nearly complete, admedian line absent, parapsidal line present, scutellum with a transverse furrow anteriorly; mesopleuron with omaulus, anteroventral remnant of episternal sulcus; acetabular carina incomplete; sternaulus and scrobal sulcus conspicuous to inconspicuous; propodeum with U-shaped enclosure, multicarinate to areolate, propodeum setae dense and long; petiole and pygidium absent. T1 anterior inclination with shallow oval depression, usually impunctate, S1 appears humped basally and medially, and forms lamella apically, S2 with deep groove at base. Forewing with three submarginal cells, media diverging after cu-a; hindwing jugal lobe present but small, media diverging before cu-a (Bohart and Menke 1976). Biology. Larve of D. corniculus (Spinola, 1807) have been described by Maneval (1939) and Evans (1959). Nests of Dolichurus are sealed with leaves and grass debris, primarily in stalks and rock crevices, or buried in holes 7–8 cm deep in the ground (Ferton 1895). Dolichurus greenei Rohwer, 1916, D. corniculus (Spinola, 1807), and D. turanicus Gussakovskij, 1940 prey on species of Ectobiidae (Grandi 1931, Krombein 1955); D. corniculus (Spinola, 1807) prey on species of Blattidae (Handlirsch 1889); and D. haemorrhous A. Costa, 1886 prey on species of Blattellidae (Adlerz 1904). Key to the species of Dolichurus Latreille, 1809 from China (Females are unknown for D. dromedarius Nagy, 1971; D. maculicollis Tsuneki, 1967; D. ombrodes Nagy, 1971; and D. shirozui Tsuneki, 1967. Males are unknown for D. alorus Nagy, 1971; D. apiciornatus Tsuneki, 1977; D. formosanus Tsuneki, 1967; D. leioceps Strand, 1913; D. nigrilamellatus Bai & Li, sp. nov.; and D. pempuchiensis Tsuneki, 1972.) 1 Female (antenna 12 segments; gaster with six segments visible; inner margin of mandible with 2–3 teeth).............................................................2 – Male (antenna 13 segments; gaster with three segments visible; inner margin of mandible unidentate subapically) .............................................11 2 Pronotal collar with transverse carina conspicuous anteriorly ..................3 – Pronotal collar without transverse carina anteriorly ...................................6 3 Clypeus without median carina (China; East Asia; Southeast Asia) ............ ................................................................................. D. leioceps Strand, 1913 – Clypeus with median carina, carina confined to basal half ........................4 334 ZooKeys 1254: 331–345 (2025), DOI: 10.3897/zookeys.1254.161007 Xuemei Bai et al.: Two new species of Dolichurus from China 4 Mesopleuron sternaulus conspicuous (China: Taiwan; East Asia; India; Japan; Malaysia; Southeast Asia; Thailand; Vietnam) ...................................... ..............................................................D. amamiensis Tsuneki & Iida, 1964 – Mesopleuron sternaulus inconspicuous or lacking ....................................5 5 Lamella nearly as long as wide (China: Taiwan) ........................................... ................................................................... D. pempuchiensis Tsuneki, 1972 – Lamella relatively longer (China: Taiwan) .....D. formosanus Tsuneki, 1967 6 Clypeus with ivory-white spot .......................................................................7 – Clypeus black .................................................................................................8 7 Anterior part of clypeus with small transverse ivory-white spot; mandible ferruginous; lateral surface of propodeum with weak, short carinae (China: Taiwan; East Asia; Laos; Southeast Asia) ................................................ ........................................................................D. apiciornatus Tsuneki, 1977 – Anterior part of clypeus with large ivory-white spot; mandible ivory white medially (Fig. 1F); lateral surface of propodeum with conspicuous, longitudinal carinae (Fig. 1D) (China: Guangdong, Jiangxi, Yunnan) ................... .................................................................. D. albipedigerus Bai & Li, sp. nov. 8 Clypeus without median carina ....................................................................9 – Clypeus with conspicuous median carina .................................................10 9 Anterior inclination of pronotum finely and densely punctate; mesopleuron densely punctate (China: Taiwan; Southeast Asia) ................................ ....................................................................................... D. alorus Nagy, 1971 – Anterior inclination of pronotum with close transverse wrinkles; mesopleuron with small mesh (China; India; Southeast Asia; Sri Lanka) ............. ............................................................................ D. aridulus Krombein, 1979 10 Mesopleuron sternaulus conspicuous (Fig. 3C); frons with rugae converging toward midline, mixed with few large punctures; lamella length almost equal to width (Fig. 3D) (China: Guangdong, Jiangxi) .................................. ................................................................ D. nigrilamellatus Bai & Li, sp. nov. – Mesopleuron sternaulus inconspicuous; frons coarsely reticulate; lamella markedly broader than long (China: Taiwan; East Asia; Southeast Asia) .... ........................................................................... D. abbreviatus Strand, 1913 11 Pronotal collar with transverse carina conspicuous anteriorly (China: Taiwan; East Asia; India; Japan; Malaysia; Southeast Asia; Thailand; Vietnam) .....................................................D. amamiensis Tsuneki & Iida, 1964 – Pronotal collar without transverse carina anteriorly .................................12 12 Clypeus ivory white except midline ............................................................13 – Clypeus black ...............................................................................................14 13 Mandible ferruginous; tegula yellowish brown, hypoepimeral area black; leg ferruginous; T1 and T2 scattered with tiny punctures (China: Taiwan; Laos; Malaysia; Southeast Asia) ...........................D. ombrodes Nagy, 1971 – Mandible ivory white medially (Fig. 2C); anterior half of tegula and hypoepimeral area ivory white (Fig. 2C, E); leg with ivory-white spots (Fig. 2A); posterior margin of T1 and T2 with tiny punctures, remainder smooth (Fig. 2H) (China: Guangdong) .................D. albipedigerus Bai & Li, sp. nov. 14 Lamella black (China: Taiwan; East Asia; Southeast Asia) ........................... ........................................................................... D. abbreviatus Strand, 1913 – Apical margin of lamella ivory white ..........................................................15 335 ZooKeys 1254: 331–345 (2025), DOI: 10.3897/zookeys.1254.161007 Xuemei Bai et al.: Two new species of Dolichurus from China 15 Pronotal tubercle black (China: Taiwan; Southeast Asia) ............................. .............................................................................D. dromedarius Nagy, 1971 – Pronotal tubercle ivory white ......................................................................16 16 Mesopleuron smooth, scattered with tiny punctures (China: Taiwan; Southeast Asia) ..............................................D. maculicollis Tsuneki, 1967 – Mesopleuron with dense rugae or punctures ............................................17 17 Mesopleuron with dense rugae, forming small mesh; gaster with large punctures (China; India; Southeast Asia; Sri Lanka) ..................................... ............................................................................ D. aridulus Krombein, 1979 – Mesopleuron with dense punctures posteriorly, punctures gradually finer and sparser anteriorly; gaster with midsized punctures, segmental punctures slightly sparser posteriorly (China: Taiwan; Southeast Asia) .............. ............................................................................... D. shirozui Tsuneki, 1967 Dolichurus albipedigerus Bai & Li, sp. nov. https://zoobank.org/37A10406-A8E5-46AF-BE74-9739ED3F6EDF Figs 1A–G, 2A–K Type material. Holotype. China • ♀; Yunnan Province, Xishuangbanna City, Tropical Botanical Garden Rubber Plantation; 22°8′3.48′′N, 100°43′5.16′′E; 24.IV−31.V.2019, collected by Qiang Li; malaise trap. Paratypes. China • 1♂; Guangdong Province, Shaoguan City, Nanling Nature Reserve, Chebaling; 24°42′50.15′′N, 114°15′43.59′′E; 464 m a.s.l.; 01.V−16.VI.2022, collected by Institute of Zoology, Guangdong Academy of Sciences; malaise trap. China • 1♀; Yunnan Province, Xishuangbanna City, Tropical Botanical Garden rainforest 2; 21°40′N, 101°24′E; 11.IV−16.V.2021, collected by Li Ma; malaise trap. China • 1♀; Guangdong Province, Shaoguan City, Nanling Nature Reserve, Chebaling; 24°42′45.34′′N, 114°15′35.94′′E; 449 m a.s.l.; 13.VIII−23.IX.2020, collected by Institute of Zoology, Guangdong Academy of Sciences; malaise trap. China • 1♀; Guangdong Province, Shaoguan City, Nanling Nature Reserve, Scale Frame; 24°49′59.44′′N, 112°47′50.23′′E; 360 m a.s.l.; 23−27.V.2023, collected by Institute of Zoology, Guangdong Academy of Sciences; malaise trap. China • 1♀; China, Guangdong Province, Shaoguan City, Nanling Nature Reserve, Forward Station; 24°26′56.01′′N, 113°7′54.28′′E; 782 m a.s.l.; 23.VII−7.VIII.2021, collected by Institute of Zoology, Guangdong Academy of Sciences; malaise trap. China • 1♀; Jiangxi Province, Longnan City, Jiulian Nature Reserve; 24°32′17.99′′N, 114°27′52.37′′E; 620 m a.s.l.; 23.VIII−4.IX.2020, collected by Institute of Zoology, Guangdong Academy of Sciences; malaise trap. Diagnosis. The new species is similar to D. apiciornatus Tsuneki, 1977, but differs from it and other congeners by the following characters (characters of D. apiciornatus in parentheses): 1) mandible ivory white medially (mandible ferruginous); 2) OOD: POD = 7: 5 (OOD: POD = 7: 6); 3) IODv: IODc = 32: 45 (IODv: IODc = 30: 40); 4) clypeus with weak median carina, anterior part with large ivory-white spot (clypeus without median carina, anterior part with small ivory-white spot); 5) lateral surface of propodeum with conspicuous, longitudinal carinae (lateral surface of propodeum with weak, short carinae anteriorly and posteriorly); and 6) body with ivory-white spots (body black). 336 ZooKeys 1254: 331–345 (2025), DOI: 10.3897/zookeys.1254.161007 Xuemei Bai et al.: Two new species of Dolichurus from China Figure 1. A–G. Dolichurus albipedigerus Bai & Li, sp. nov., holotype, ♀. A. Habitus, lateral view; B. Head, pronotum, scutum, and scutellum, dorsal view; C. Habitus, dorsal view; D. Head and thorax, lateral view; E. Eing; F. Head, frontal view; G.Propodeum, dorsal and posterior view. Scale bars: 1 mm. Description. Female. Body length 10.0−11.3 mm. Black. Nearly entire apical half of lamella ivory white, middle boundary M-shaped; anterior part of clypeus with ivory-white spot, apical lobe transparent yellow. The following ivory white: 337 ZooKeys 1254: 331–345 (2025), DOI: 10.3897/zookeys.1254.161007 Xuemei Bai et al.: Two new species of Dolichurus from China mandible medially, palpi largely, pronotal tubercle, anterior half of tegula, hypoepimeral area; remaining palpi light brown. The following with ivory-white marks: fore femora apically, outside of mid and hind coxae, tibiae and hind femora. Fore and mid tibiae spurs white, hind tibiae spurs light brown; remainder brown. Wing hyaline and iridescent, veins and stigma light brown (Fig. 1E). Gastral segments IV−VI reddish brown. Vestiture silvery pubescence; most of frons and vertex with silvery, erect pubescence; side of lamella and frons below lamella with appressed silvery pubescence; mandible with yellow, erect macrochaetae. Gaster smooth, practically impunctate (Fig. 1A, B). Head. In front view, nearly subcircular in outline, HW: HL = 90: 85. Mandible broad and blunt, inner margin tridentate. Clypeus smooth, convex medially, with weak median carina in basal half, apical lobe subtruncate, base width: middle width: apical width = 15: 45: 10 (Fig. 1F). Antennae 12 segments, scape with weak ventral carina. Relative length of antennal segments I: II: III: IV: V: VI: VII: VIII: IX: X: XI: XII = 26: 9: 37: 31: 32: 30: 26: 23: 20: 20: 19: 17. A3/aW = 5.3, A12/ bW = 4.3. Lamella broadened and flat, length: width = 12: 27. Frontal line complete, nearly reaching midocellus, and slightly concave at base of lamella. Frons with weak wrinkles above lamella, mixed with tiny punctures, side of frons with tiny punctures. Inner margins of eyes slightly convergent above, IODv: IODc = 32: 45 (Fig. 1F). POD: OD: OOD = 5: 6: 7, side of ocelli scattered with tiny punctures. In dorsal view, vertex shiny, scattered with tiny punctures, slightly arched above eyes (Fig. 1B). In lateral view, eyes: gena = 29: 12 (Fig. 1D). Thorax. Pronotum smooth, scattered with tiny punctures, without transverse carina anteriorly, small punctures confluent in several transverse puncture-rows anteriorly, pronotal tubercle slightly raised, hardly projects over level of scutum (in lateral view), median impression shallow (Fig. 1B, D). Scutum and scutellum shiny, scattered with tiny punctures (Fig. 1B). Mesopleuron smooth, scattered with tiny punctures, scrobal sulcus inconspicuously depressed, sternaulus conspicuous (Fig. 1D). Metanotum scattered with punctures (Fig. 1G). Dorsal surface of propodeum with six longitudinal carinae, including two longitudinal carinae, two oblique carinae on either side, and two oblique, longitudinal carinae located further out to sides. Posterior surface of propodeum with radiating reticulation, lateral margin with blunt tooth halfway from dorsum (Fig. 1G). In lateral view, dorsal and posterior surfaces forming obtuse angle, lateral surface of propodeum with conspicuous, longitudinal carinae (Fig. 1D). Ventral surface of tarsi with 2 rows of parallel spines (Fig. 1A, C). Gaster. Six segments visible. LT1: WT1 = 37: 66. Terga smooth. Lateral side of T1 with conspicuous, longitudinal carinae. Sterna I-VI with small to midsized punctures (Fig. 1A, C). Male. Similar to female, but body smaller, body length 7.0 mm (Fig. 2A, B). Head in front view, HW: HL =83: 77. Most of frons, vertex, and gena with silvery, erect long setae. Mandible sharper and slenderer than that of female, inner margin unidentate subapically. Clypeus ivory white except median line and base, median carina extending to anterior margin, base width: middle width: apical width = 15: 44: 11 (Fig. 2D). Antennae 13 segments, scape ventral carina stronger than female. Relative length of antennal segments I: II: III: IV: V: VI; VII: VIII: IX: X: XI: XII: XIII= 27: 7: 28: 26: 26: 23: 21: 20: 17: 11: 11: 10: 12. A3/aW = 5.6, A12/bW = 4, A6-11 slightly swollen in middle on ventral surface, swelling bearing conspicuous, erect seta (Fig. 2G). Inner margins of eyes slightly 338 ZooKeys 1254: 331–345 (2025), DOI: 10.3897/zookeys.1254.161007 Xuemei Bai et al.: Two new species of Dolichurus from China Figure 2. A–K. Dolichurus albipedigerus Bai & Li, sp. nov., paratypes, ♂. A. Habitus, lateral view; B. Habitus, dorsal view; C.Head and thorax, lateral view; D. Head, frontal view; E. Head, pronotum, and scutum, dorsal view; F. Scutellum and propodeum, dorsal view; G. Antennae; H. Gaster, dorsal view; I. Genitalia, dorsal view; J. Genitalia, ventral view; K. Genitalia, lateral view. Scale bars: 1 mm. 339 ZooKeys 1254: 331–345 (2025), DOI: 10.3897/zookeys.1254.161007 Xuemei Bai et al.: Two new species of Dolichurus from China convergent above, IODv: IODc = 42: 45 (Fig. 2D). POD: OD: OOD = 8: 6: 10 (Fig. 2D, E). In dorsal view, arched above eyes, stronger than female (Fig. 2E). In lateral view, eyes: gena = 23: 23, palpi light brown (Fig. 2C). Thorax covered with silvery long setae (Fig. 2C, E, F). Pronotum narrower than female (Fig. 2C, E). Dorsal surface of propodeum delicate and thinner than female, with four longitudinal carinae, without oblique carinae (Fig. 2F). Outside of hind femora spots larger than female (Fig. 2A). Gaster with three segments visible. LT1: WT1 = 38: 62. Posterior of T1 and T2, most of T3 with tiny punctures, reminder smooth. S2 and S3 scattered with tiny punctures, but S3 denser, punctures on S3 converged longitudinally to form rugose towards apex, posterior margin significantly transverse, arched concave (Fig. 2A, H). Genitalia from above, penis valves at apex elongated oval, each half on inner ventral margin serrate, conspicuously short, laterally bulged and meeting in a midline; parameres broad at base, apical part broadly pale and frequently folded over, with few erect bristles at apex. Genitalia from beneath, each half of parameres scattered with short bristles; digitus and cuspis of volsella at apex fuscous, digitus produced vertically like a short, thick bill (Fig. 2I–K). Distribution. China (Guangdong, Jiangxi, Yunnan). Etymology. The specific name albipedigerus is derived from the Latin stem alb - (= white) and the Latin word pedigerus (= ped), which refers to the leg with ivory-white spots. Dolichurus nigrilamellatus Bai & Li, sp. nov. https://zoobank.org/4F6920D5-AC32-436A-BBE9-AC6F3F667568 Fig. 3A–I Type material. Holotype. China • ♀; Guangdong Province, Shaoguan City, Nanling Nature Reserve, Scale Frame; 24°54′45.81′′N, 113°2′33.64′′E; 844 m a.s.l.; 22.IX−13.X.2020, collected by Institute of Zoology, Guangdong Academy of Sciences; malaise trap. China • 1♀; Jiangxi Province, Ganzhou City, Jiulian Nature Reserve, Wudang Town, Chunhui Farm; 24°36′13.18′′N, 114°42′18.88′′E; 467 m a.s.l.; 7.VI.2021, collected by Yongying Ruan; light trap. Diagnosis. The new species is similar to D. aposanus Tsuneki et al., 1992, but differs from it and other congeners by the following characters (characters of D. aposanus in parentheses): 1) frontal line weak, frons with dense rugae converging toward midline above lamella (frontal line absent, frons sparsely punctate); 2) inner margin of mandible bidentate (inner margin of mandible tridentate); 3) A3/aW = 4, A12/bW = 4.2 (A3/aW = 4.5, A12/bW = 6.0); 4) eyes: gena = 29: 15 (eyes: gena = 34: 10); 5) sternaulus present (sternaulus absent); and 6) posterior margin of T1-T3 tiny puncture-rows absent medially (posterior margin of T1-T3 with complete tiny puncture-rows). Description. Female. Body length 12.3−12.9 mm. Black, apical margin of lamella dark brown. Mandible ferruginous-orange; maxillary and labial pale brown. Tegula dark brown. Inner surface of fore tibiae apically light yellowish brown, tarsi brown. Wing hyaline and iridescent, veins and stigma brown (Fig. 3E). Vestiture with silvery pubescence; most of frons and vertex with silvery erect pubescence; side of lamella and frons below lamella with appressed silvery pubescence, mandible with yellow erect macrochaetae. Gaster smooth,