Dipogon (Stigmatodipogon) himalayensis, 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 : 298-299

Key to species

Females (modified from Shimizu et al. 2018 and Loktionov & Lelej 2019)

(unknown in D. (S.) lao Loktionov & Lelej, 2018)

1. Fore wing without fasciae ( Fig. 15 ). Body integument strongly polished ( Figs 8, 9 ). Frons ( Fig. 14 ) and disc of propodeum ( Fig. 13 ) smooth, with indistinct punctures. (North-eastern India).................... D. (S.) himalayensis Loktionov , sp. nov.

- Fore wing with basal and preapical fasciae. Body integument not strongly polished, but sculptured and mostly matt. Frons and disc of propodeum matt, shagreened or weakly polished, with distinct punctures................................... 2

2. Legs mostly yellowish-brown........................................................................... 3

- Legs dark brown or black............................................................................... 4

3. Gena in dorsal view developed, roundly receding posteriorly ( Shimizu et al. 2018: fig. 1A). Frons impunctate with minute setiferous pores ( Shimizu et al. 2018: fig. 1B). (Russian Far East: Kunashir Is.)....... D. (S.) budrisi (Loktionov & Lelej)

- Gena in dorsal view not developed, strongly receding posteriorly ( Shimizu et al. 2018: fig. 3F). Frons densely and finely punctate ( Shimizu et al. 2018: fig. 3A). ( Japan: Hokkaido, Honshu)............................ D. (S.) kurokawai Shimizu

4. Frons minutely punctate, intervals almost smooth and strongly polished ( Shimizu et al. 2018: fig. 9A). Propodeum with sublateral narrow groove behind stigma ( Shimizu et al. 2018: fig. 9B). ( Japan: Honshu)............... D. (S.) tanakai Ishikawa

- Frons shagreened and matt ( Shimizu et al. 2018: fig. 6A) or densely punctate, intervals alutaceous and weakly polished ( Shimizu et al. 2018: fig. 7A). Propodeum without sublateral groove behind stigma................................... 5

5. Frons shagreened and matt ( Fig. 3 ; Shimizu et al. 2018: fig. 6A). Gena in dorsal view strongly receding ( Shimizu et al. 2018: fig. 6B)............................................................................................. 6

- Frons densely punctate and polished, interspace of punctures alutaceous and weakly polished ( Shimizu et al. 2018: fig. 7A). Gena in dorsal view weakly receding ( Shimizu et al. 2018: fig. 7B)............................................. 7

6. Vertex in dorsal view with posterior margin straight ( Loktionov & Lelej 2019: fig. 4). Gena and propleuron with scattered long pale setae ( Loktionov & Lelej 2019: fig. 5). F1 length 5.25 × its maximum width. Propodeum strongly and densely punctate. Basal petiole of T1 distinctly parallel-sided medially ( Loktionov & Lelej 2019: fig. 7). (Northern Thailand)......................................................................................... D. (S.) siam Loktionov & Lelej

- Vertex in dorsal view with posterior margin concave ( Shimizu et al. 2018: fig. 6B). Gena and propleuron without setae. F1 length 5.6–6.5 × its maximum width. Propodeum minutely reticulo-rugulose. Basal petiole of T1 not parallel-sided medially ( Shimizu et al. 2018: fig. 6G). ( Japan: Honshu)................................... D. (S.) macrostigmatus Ishikawa

7. Basal petiole of T1 long and distinctly parallel-sided medially ( Fig. 6 ; Loktionov & Lelej 2019: fig. 16). Apical half of clypeus yellowish-brown ( Fig. 3 ; Loktionov & Lelej 2019: fig. 13).................................................... 8

- Basal petiole of T1 shorter and not parallel-sided medially ( Shimizu et al. 2018: fig. 7F; Kochetkov & Loktionov 2019: fig. 7). Clypeus entirely black ( Shimizu et al. 2018: fig. 7A)......................................................... 9

8. Four apical flagellomeres yellow-brown ( Figs 1–3 ). Pterostigma wide, its length 3.2 × its maximum width, and its length 1.05× SMC2 and SMC3 length combined together on vein M ( Fig. 7 ). F1 length 3.6 × its maximum width. POD: OOD = 1.25. (Northern Thailand)..................................................... D. (S.) chiangmai Loktionov , sp. nov.

- Four apical flagellomeres black ( Loktionov & Lelej 2019: fig. 11). Pterostigma narrow, its length 3.75 × its maximum width, and its length 0.9 × SMC2 and SMC3 length combined together on vein M ( Loktionov & Lelej 2019: Fig. 18). F1 length 4.5–4.8 × its maximum width. POD: OOD = 1.0–1.05. (Northern Laos)................... D. (S.) wasbaueri Loktionov & Lelej

9. Hind claw dentate, with strong tooth preapically. POD: OOD = 1.56. F1 length 3.6 × its maximum width. ( Russia: Amur Prov.).......................................................... D. (S.) khinganicus (Kochetkov & Loktionov)

- Hind claw edentate or with minute tooth preapically. POD: OOD = 1.0–1.28. F1 length 4.6–5.3 × its maximum width. ( Russia: Irkutsk Prov., Primorskii Terr.)........................................................ D. (S.) petiolatus Lelej

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.

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.