Thrinchostoma (T.) yunnanense Niu & Zhu

Zeqing Niu, Feng Yuan, Pia Oremek, Feng Liu & Chaodong Zhu, 2016, Thrinchostoma Saussure, little known bee genus from China, with description of a new species (Hymenoptera: Halictidae), Zoological Systematics 41 (2), pp. 207-215 : 209

Key to Chinese known species of Thrinchostoma (Thrinchostoma) .

1. Flagellum 11-segmented, male ...........................................................................................................................................................2

Flagellum 10-segmented, female .......................................................................................................................................................3

2. Malar area nearly as long as the width of mandible base ( Fig. 3 ); trochanter of hind leg ventrally with angular projection ( Fig. 6 ); second marginal crossvein reaching the radial nervure ( Fig. 7 ) ...................................... Thrinchostoma (T.) sladeni Cockerell, 1913

Malar area longer than the width of mandible base ( Fig. 19 ); trochanter of hind leg ventrally normal, without angular projection ( Fig. 22 ); second marginal crossvein not reaching the radial nervure ( Fig. 23 ) ..................................................................................... ....................................................................................................................... Thrinchostoma (T.) yunnanense Niu & Zhu , sp. nov.

3. Malar area about one-third as long as the width of mandible base ( Fig. 13 ); second marginal crossvein angulated medially ( Fig. 14 ); apical one-third part of clypeus yellowish-brown, other part of clypeus black ( Fig. 12 ); T2 with broad orange apical margin ( Fig. 15 ) ....................................................................................................................................... Thrinchostoma (T.) sladeni Cockerell, 1913

Malar area longer than the width of mandible base ( Fig. 29 ); second marginal crossvein straight medially ( Fig. 30 ); whole clypeus dust yellow ( Fig. 28 ); T2 without broad orange apical margin ( Fig. 31 )......... Thrinchostoma (T.) yunnanense Niu & Zhu , sp. nov.

Figures

Figures 1 – 6. Thrinchostoma (T.) sladeni Cockerell, 1913, male. 1. Habitus, lateral view. 2. Head, frontal view. 3. Head, lateral view. 4. Metasoma, dorsal view, showing T 1 – 2. 5. Metasoma, ventral view. 6. Hind leg, lateral view, showing the trochanter, femur and tibia. Scale bars = 1 mm.

Figures 7 – 10. Thrinchostoma (T.) sladeni Cockerell, 1913, male. 7. Fore wing, dorsal view, showing second submarginal crossvein and the hair spot. 8. Genitalia, dorsal view. 9. Genitalia, lateral view. 10. S 7 – 8, ventral view. Scale bars = 1 mm.

Figures 17 – 22. Thrinchostoma (T.) yunnanense Niu & Zhu, sp. nov., male. 17. Habitus, lateral view. 18. Head, frontal view. 19. Head, lateral view. 20. Metasoma, dorsal view, showing T 1 – 2. 21. Metasoma, ventral view. 22. Hind leg, lateral view, showing the trochanter, femur and tibia. Scale bars = 1 mm.

Figures 23 – 26. Thrinchostoma (T.) yunnanense Niu & Zhu, sp. nov., male. 23. Fore wing, dorsal view, showing second submarginal crossvein and the hair spot. 24. Genitalia, dorsal view. 25. Genitalia, lateral view. 26. S 7 – 8, ventral view. Scale bars = 1 mm.

Figures 11 – 16. Thrinchostoma (T.) sladeni Cockerell, 1913, female. 11. Habitus, lateral view. 12. Head, frontal view. 13. Head, lateral view. 14. Fore wing, dorsal view, showing second submarginal crossvein angulated medially. 15. Metasoma, dorsal view, showing T 1 – 2. 16. Hind tibia, showing the inner tibial spur. Scale bars = 1 mm.

Figures 27 – 32. Thrinchostoma (T.) yunnanense Niu & Zhu, sp. nov., female. 27. Habitus, lateral view. 28. Head, frontal view. 29. Head, lateral view. 30. Fore wing, dorsal view, showing second submarginal crossvein stright medially. 31 Metasoma, dorsal view, showing T 1 – 2. 32. Hind tibia, showing the inner tibial spur. Scale bars = 1 mm.