Dipogon (Stigmatodipogon) chiangmai 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 : 295-296

Dipogon (Stigmatodipogon) chiangmai Loktionov , sp. nov.

( Figs 1–7 )

Diagnosis. The female of this species differs from those of other species of the subgenus by the combination of following characters: the frons very densely punctate, interspace of punctures weakly polished; the basal petiole of the T1 long and parallel-sided medially ( Figs 2, 6 ); the pterostigma widened, its length 3.2 × its maximum width, and its length 1.05 × SMC2 and SMC3 length combined together on vein M ( Fig. 7 ); the four apical flagellomeres yellow-brown ( Figs 1–3 ). The male is unknown.

Description. FEMALE. Length: body 3.6 mm; fore wing 3.1 mm. Body black ( Figs 1, 2 ). Following brown: apical half of clypeus, mandible, and legs. Antenna mostly brown with four apical flagellomeres distinctly yellowbrown ( Figs 1–3 ); scape, pedicel and F1 ventrally somewhat yellowish. Body covered with short grayish micropubescence. Vertex with two long brown erect setae; clypeus preapically and mandible with few long pale setae; S2–S5 with scattered long erect pale setae; T6 and S6 with light brown long dense setae. Head and mesosoma finely and densely punctate and somewhat polished. Frons very densely punctate, interspace of punctures noticeably shorter than diameter of punctures medially and weakly polished. Metasoma micro-reticulate, somewhat polished.

Head width 1.07 × its length in frontal view. Vertex in frontal view weakly convex ( Fig. 3 ), in dorsal view its posterior margin concave ( Fig. 4 ). Inner orbits slightly convergent above, subparallel below ( Fig. 3 ). UID: MID: LID = 30: 42: 36. MID 0.6 × head width. Frons in profile evenly convex ( Fig. 5 ), with frontal line indistinct. Gena in dorsal view rather strongly receding ( Fig. 4 ); its width 0.48 × eye width in lateral view ( Fig. 5 ). Ocellar triangle right-angled ( Fig. 4 ), slightly raised. POD: OOD = 1.25. Clypeus as broad as LID, convex medially, its width 2.5 × its length; apicolateral corner rounded; apical margin straight. Malar space short. F1 length 3.6 × its maximum width, 1.2 × F2 length, and 0.6 × UID. F7 length 1.6 × its maximum width.

Pronotum slightly depressed near posterior margin, latter being obtusely angulate medially; anterior declivity not differentiated from dorsum; shoulder barely swollen. Discs of mesoscutellum and metanotum slightly convex. Metapostnotum length 0.13 × metanotum length medially. Propodeum gently and evenly convex in profile, without medial groove dorsally. Meso- and metatibia without spines laterally. Longer spur of metatibia 0.48 × metatarsomere 1 length. Metatarsomere 5 length 1.5 × metatarsomere 4 length, and metatarsomere 5 width 1.2 × metatarsomere 4 width. Tarsal claws dentate, with tiny acute tooth preapically.

Fore wing with two brown fasciae ( Fig. 7 ). Pterostigma enlarged; its length 1.67 × SMC2 length; its width 1.0 × SMC2 width; its length 3.2 × its maximum width, and its length 1.05 × SMC2 and SMC3 length combined together on vein M. SMC2 narrowed on vein Rs by 0.8 × its own length on vein M, receiving crossvein 1m-cu at middle. SMC3 narrowed on vein Rs by 0.55 × its own length on vein M, receiving crossvein 2m-cu at basal 0.27. SMC3 length 0.9 × SMC2 length on vein M, and 0.62 × on vein Rs. Crossvein 2rs-m barely arcuate. Crossvein 3rs-m strongly curved. Hind wings are damaged, hence no data available.

T1 with long parallel-sided petiole basally ( Figs 2, 6 ).

Material examined. Holotype, ♀, Northern Thailand, Chiang Mai Prov., San Pa Kia , 1400 m, 19°19′N, 98°50′E, 1–15.V.1998 (Vít Kubáň) [OLL].

Etymology. This new species is named after Chiang Mai Province of Thailand where the holotype was collected. Treated as a noun in apposition.

Distribution. Northern Thailand (Chiang Mai).

Figures

FIGURES 1–7. Dipogon (Stigmatodipogon) chiangmai Loktionov, sp. nov., holotype, ♀. 1. Whole body, lateral view. 2. Whole body, dorsal view. 3. Head and antenna, frontal view. 4. Head, pronotum, and antenna part., dorsal view. 5. Head, lateral view. 6. Metanotum, propodeum, T1, and T2 part., dorsal view. 7. Fore wing. Scale bar: 1.0 mm for 1, 2 and 7; 0.2 mm for 3–6.