Dipogon (Stigmatodipogon) himalayensis Loktionov, 2020

Loktionov, Valery M., 2020, New remarkable species of the subgenus Stigmatodipogon Ishikawa, 1965 of the genus Dipogon Fox, 1897 (Hymenoptera: Pompilidae) from Thailand and India, Zootaxa 4755 (2), pp. 294-300 : 297-298

Dipogon (Stigmatodipogon) himalayensis Loktionov , sp. nov.

( Figs 8–16 )

Diagnosis. The female differs from those of other species of the subgenus by having: the body integument strongly polished ( Figs 8–14 ); the frons and disc of the propodeum dorsally smooth, with indistinct punctures ( Figs 9, 13, 14 ); the fore wing evenly yellowish-brown, without fasciae ( Fig. 15 ). The male is unknown.

Description. FEMALE. Length: body 6.5 mm; fore wing 5.9 mm. Body black ( Figs 8, 9 ), with protarsi, mandible apically and palpi somewhat brownish. Body without pubescence, except propleura, mesopleura ventrally, and coxae with somewhat gray micropubescence. Vertex and frons along inner orbit with one long and few shorter dark brown erect setae. Gena with scattered very short and appressed setae. Clypeus apically and mandible with long brown bristles. Propodeum dorso-laterally with few very short thin brown erect setae. S2 with sparse brown erect setae. S5 and T5 with dense long pale bristles on apical half. Inner face of hind tibia with golden-brown brush of setae.

Body integument strongly polished ( Figs 8–14 ). Frons ( Fig. 14 ) and propodeum dorsally ( Fig. 13 ) smooth with indistinct punctures. Pronotum, mesoscutum, mesoscutellum, metanotum, meso- and metapleura, and metasoma with very fine scattered punctures. Clypeus with few setiferous pores preapically.

Head width 1.1 × its length in frontal view. Vertex in frontal view barely convex ( Fig. 14 ), its posterior margin arcuate in dorsal view. Inner orbits slightly convergent above, subparallel below ( Fig. 14 ). UID: MID: LID = 47: 63: 62. Frons in profile hardly convex ( Fig. 10 ); frontal line impressed only below. MID 0.55 × head width in frontal view. Gena width 0.41 × eye width in lateral view ( Fig. 10 ). Ocellar triangle acute-angled ( Fig. 11 ), slightly raised. POD: OOD = 0.68. Clypeus width 2.45 × its length, slightly convex medially, depressed laterally; apicolateral corner rounded; apical margin straight ( Fig. 12 ). Labrum well exposed, its apical margin arcuate medially ( Fig. 12 ). Malar space short and linear. F1 length 6.2 × its width, 1.3 × F2 length, and 1.0 × UID.

Pronotum weakly convex dorsally; posterior margin weakly arcuate; anterior declivity not differentiated from dorsum; shoulder distinctly swollen. Discs of mesoscutellum and metanotum weakly convex. Metapostnotum length 0.15 × metanotum length medially. Propodeum evenly convex in profile, without definite median groove dorsally. Mid and hind tibia with few very short rudimentary spines. Longer spur of hind tibia 0.43 × metatarsomere 1 length. Metatarsomere 5 length 1.55 × metatarsomere 4 length, and metatarsomere 5 width 1.1 × metatarsomere 4 width. Tarsal claws dentate, with stout acute tooth preapically.

Wings ( Figs 15, 16 ) evenly yellowish-brown, without fasciae; veins brown. Fore wing ( Fig. 15 ) with pterostigma length 1.6 × SMC2 length (on vein M). SMC2 narrowed on vein Rs by 0.68 × its own length on vein M, receiving crossvein 1m-cu at middle. SMC3 length 1.1 × SMC2 length on vein M, and 0.76 × on vein Rs, narrowed on vein Rs by 0.45 × its own length on vein M, receiving crossvein 2m-cu at basal 0.25. Crossvein 2rs-m barely arcuate. Crossvein 3rs-m double curved near Rs and M. Hind wing crossvein cu-a confluent with vein A, long and sinuate ( Fig. 16 ).

T1 with long petiole basally, sides of petiole gently arcuate ( Fig. 13 ).

MALE. Unknown.

Material examined. Holotype, ♀, North-eastern India, Arunachal Pradesh, Etalin , 700 m, 28°36.56’ N, 95°53.21’ E, 15–25.V.2012 (O. Šauša) [OLL].

Etymology. The specific name himalayensis refers to the Eastern Himalaya where the holotype was collected. Treated as a noun in apposition.

Distribution. North-eastern India (Arunachal Pradesh).

Figures

FIGURES 8–16. Dipogon (Stigmatodipogon) himalayensis Loktionov, sp. nov., holotype, ♀. 8. Whole body, lateral view. 9. Whole body, dorsal view. 10. Head, lateral view. 11. Head, dorsal view. 12. Clypeus and mandibles, frontal view. 13. Propodeum and T1, dorsal view. 14. Head, frontal view. 15. Fore wing. 16. Hind wing. Scale bar: 1.0 mm for 8, 9, 15, and 16; 0.5 mm for 13; 0.2 mm for 10–12, and 14.