Stigmatodipogon lao Loktionov & Lelej, 2018

Shimizu, Akira, Lelej, Arkady S., Loktionov, Valery M., Nishimoto, Yutaka & Endo, Tomoji, 2018, Revision of the subgenus Stigmatodipogon Ishikawa of the genus Dipogon Fox (Hymenoptera: Pompilidae: Pepsinae), Zootaxa 4514 (1), pp. 1-22 : 11-13

3. Stigmatodipogon lao Loktionov & Lelej , sp. nov.

( Fig. 5 )

Diagnosis. The male of this species differs from those of other species by having the gena well-developed ( Figs 5C, 5D ); a large pterostigma, SMCs 2 and 3 small ( Fig. 5G ); metasomal tergum I with a long and narrow petiole ( Fig. 5F ); and metasomal sternum II without a transverse groove. FEMALE. Unknown.

Description. MALE (holotype). Length: body 2.7 mm; fore wing 2.6 mm. Mostly black ( Fig. 5A ). Mandible yellowish-brown medially, brown apically. Palpi brown. Clypeus yellowish-brown anteriorly. Scape and pedicel brown dorsally, yellowish-brown ventrally. Flagellomeres I and II brown ventrally. Fore and mid tarsi brown. Wings not infuscate; fore wing with weak fuscous band on SMCs 2 and 3 and second discoidal cell anteriorly; pterostigma brown ( Fig. 5G ).

Lower frons, pronotum and propodeum with weak gray pubescence. Body without setae, except for mandible with few pale setae.

Head and mesosoma matte, except for propodeum somewhat polished; metasoma distinctly polished. Head and mesosoma punctate. Frons, discs of pro-, meso- and metanota, and meso- and metapleura finely and densely punctate. Clypeus irregularly and finely punctate without smooth apical rim. Metanotum with deep transverse concavity laterally ( Fig. 5H ). Metapostnotum with two fine transverse striae anteriorly. Disc of propodeum with punctures somewhat larger than those on disc of mesoscutum. Metasomal segments finely alutaceous without any punctures.

Head width in frontal view 1.1× length. UID: MID: LID = 28: 33: 25. MID 0.61× head width. Half of MID 1.6× eye width. Vertex in frontal view moderately convex between eye tops ( Fig. 5B ). Upper frons gently convex ( Fig. 5E ). Frons without frontal line. Inner orbits subparallel above, convergent below ( Fig. 5B ). Ocelli large, noticeably raised; ocellar triangle hardly obtuse-angled ( Fig. 5C ); POD: OOD = 1: 0.83. Posterior margin of vertex in dorsal view gently concave ( Fig. 5C ). Clypeus width 2.3 × length, weakly convex medially; anterolateral corner rounded; anterior margin straight. Mandible with subapical tooth. Malar space short. Gena in dorsal view roundly receding ( Fig. 5C ), its width in profile 0.65 × eye width ( Fig. 5E ). Flagellum filiform; flagellomeres VII–X somewhat subangulate ventrally and weakly concave dorsally; scape, pedicel and flagellomeres I–IV in ratio of 10:5:13:13:12:12; flagellomere I length 2.8× width, 0.5× UID.

Pronotum with anterior declivity distinctly differentiated from dorsum; dorsum in dorsal view weakly narrowing anteriorly; shoulder gently and roundly receding anteriorly; juncture between dorsal and lateral faces weakly and roundly raised; posterior margin weakly and arcuately emarginate ( Fig. 5D ). Mesoscutum evenly and noticeably convex with posterolateral rim distinctly raised; parapsidal sulcus indistinct. Metapostnotum 0.3× as long as metanotum at midline; posterior margin arcuately emarginate. Propodeum length 1.0 × width, evenly convex with posterior declivity not differentiated from dorsum; disc hardly raised above level of metapostnotum.

Fore wing ( Fig. 5G ) with pterostigma large, its length 2.1 × SMC2 length, its width 1.1 × SMC2 width. Marginal cell removed from wing tip by 0.56 × its length. SMC2 length 1.4 × width, narrowed on vein Rs by 0.80 × its own length on vein M, receiving crossvein 1m-cu at basal 0.57. SMC3 length 1.2 × width, 0.95 × SMC2 length on vein M, 0.5 × SMC2 length on vein Rs, narrowed on vein Rs by 0.4 × its own length on vein M, receiving crossvein 2m-cu at basal 0.2.

Meso- and metatibia with few minute spines laterally. Longer spur of hind tibia 0.53 × hind tarsomere I length. Claws symmetrical with indistinct subapical inner tooth.

Metasomal sternum VI with posterior margin arcuately emarginate medially ( Fig. 5I ). Lateral hook on metasomal sternum VI straight and flattened, directed caudad ( Fig. 5I ), tapering but rounded at apex ( Fig. 5J ). SGP ( Figs 5K, 5L ) abruptly narrowed subapically, truncate apically. Genitalia ( Fig. 5M ): paramere large and extending far beyond apex of parapenial lobe with inconspicuous sparse setae laterally.

Material examined. Holotype, ♂, LAOS, Phongsaly Prov., Phongsaly env., 1500 m, N 21°41' E 102°06', vi.2003 (Pacholátko) [ OLL].

Etymology. The new species is named after Laos, the country where the holotype was collected.

Distribtion. Laos.

Biology. Unknown.

Figures

FIGURE 5. Dipogon (Stigmatodipogon) lao, sp. nov., holotype, ♂. A. Head, mesosoma and metasoma anteriorly, dorsolateral view. B. Head, frontal view. C. Head and pronotum, dorsal view. D. Head, pro-, meso- and metanota and metapostnotum, dorsal view. E. Head and pronotum, lateral view. F. Metasomal tergum I, dorsal view. G. Fore wing. H. Scutellum, metanotum, metapostnotum and propodeum, dorsal view. I. Metasomal sternum VI, ventral view. J. Same, lateral view. K. Metasomal sternum VII and SGP, ventral view. L. Same, lateral view. M. Genitalia, ventral view. Scale bars: 0.2 mm for A–H, 0.1 mm for I–M.