Carinostigmus, Tsuneki, 1954

Rajan, Tessy, Sureshan, P. M. & Kumar, P. Girish, 2020, Additions to the knowledge on the genus Carinostigmus Tsuneki (Hymenoptera Crabronidae: Pemphredoninae) from the Indian subcontinent with the description of two new species, Zootaxa 4881 (1), pp. 152-164 : 153-154

Key to species of Carinostigmus from the Indian subcontinent (based on females)

1. Mandibles bidentate................................................................................... 2

- Mandibles tridentate................................................................................... 3

2. Inner and outer mandibular tooth almost equal in length; metanotum with parallel vertical ridges converging slightly toward middle; following structures white: palpi, basal half of mandible, apex of labrum, underside of scape, and pronotal tubercle.................................................................................. C. bucheilus Krombein

- Inner mandibular tooth distinctly shorter than outer; metanotum smooth without parallel vertical ridges; only pronotal lobe yellowish white to white, other structures testaceous............... C. parliensis Tessy, Sureshan & Girish Kumar , sp. nov.

3. Face with median ridge weak, without projection near middle [ Figure 19 of Krombein (1984)]; groove along inner eye margin weakly crenulate; metasomal petiole stouter [ Figure 48 of Krombein (1984)], 4× as long as median width................................................................................................. C. clypeolus Krombein

- Face with median carina stronger and armed with erect projection near middle [ Figure 18 of Krombein 1984]; groove along inner eye margin strongly crenulate; metasomal petiole more slender [ Figs 49–52 of Krombein (1984)], 5–8.5 × as long as median width............................................................................................... 4

4. Petiole stouter [ Figure 51 of Krombein (1984)], about 5–6.5 × as long as median width.............................. 5

- Petiole more slender [ Figures 49, 50 of Krombein (1984)], 7.5–8.5 × as long as median width........................ 7

5. Propodeal enclosure except basal section with irregular oblique transverse striations and smooth area posteriorly ( Fig. 18 ); apex of clypeus almost rounded, not emarginated.................. C. nepalensis Tessy, Sureshan & Girish Kumar , sp. nov.

- Propodeal enclosure except basal section rugoso-reticulate ( Figs 28 & 37 ); apex of clypeus slightly emarginated.......... 6

6. Underside of head with strong longitudinal costae except median area with delicate longitudinal lineolations narrowly ( Fig. 24 ); mandible with narrow ivory streak near base............................................... C. costatus Krombein

- Underside of head moderately densely punctate especially towards middle and usually with few parallel carinae laterally ( Fig. 33 ); mandible with no ivory markings.................................................... C. aterrimus (Turner)

7. Declivous surface of pronotum anterior to transverse ridge smooth or with only evanescent irregular rugulae; interocular distance at anterior ocellus 1.4–1.5 × that at antennal insertions.................................. C. congruus (Walker)

- Declivous surface of pronotum anterior to transverse ridge with vertical rugae; interocular distance at anterior ocellus 1.2–1.3 × that at antennal insertions............................................................ C. griphus Krombein

Figures

FIGURES 11–20. Carinostigmus nepalensis Tessy, Sureshan & Girish Kumar, sp. nov., Holotype ♀. 11. Habitus, lateral view; 12. Head, frontal view; 13. Lower half of head, frontal view; 14. Mandible; 15. Head and mesosoma, dorsal view; 16. Mesosoma, lateral view; 17. Fore wing; 18. Propodeum; 19. Petiole and first tergite; 20. Metasoma, dorsal view.

FIGURES 46–54. Carinostigmus griphus Krombein ♀. 46. Habitus, lateral view; 47. Head, in frontal view; 48. Lower half of head; 49. Head, pronotum, mesoscutum and scutellum, dorsal view; 50. Mesosoma, lateral view; 51. Fore wing; 52. Hindwing; 53. Propodeum; 54. Metasoma, dorsal view.

FIGURES 21–29. Carinostigmus costatus Krombein ♀. 21. Habitus, lateral view; 22. Head, frontal view; 23. Lower half of head; 24. Under side of head; 25. Head, pronotum, mesoscutum and scutellum, dorsal view; 26. Mesosoma, lateral view; 27. Fore wing; 28. Propodeum; 29. Metasoma, dorsal view.

FIGURES 30–38. Carinostigmus aterrimus (Turner) ♀. 30. Habitus, lateral view; 31. Head, frontal view; 32. Mandible; 33. Underside of head; 34. Head, pronotum, mesoscutum and scutellum, dorsal view; 35. Mesosoma, lateral view; 36. Fore wing; 37. Propodeum; 38. Metasoma, dorsal view.