164 DIPTEROUS GENUS DIAPHORUS 



11. Eyes broadly contiguous, tibiae yellow, at most yellowish 



brown, (Eastern species). 8, opacns Loew. 



Eyes narrowly contiguous, legs altogether black. (Western 



species). 9, adustus n.sp. 



12. Tegulae, their cilia and the halters black, length 2 mm. 



10, gibbosus n.sp. 



Tegulae and halters yellowish, cilia of the tegulae black to 



pale yellow, length 3.5-4 mm. 12, spectabilis Loew. 



13. Pulvilli of fore tarsi not or but slightly enlarged. 14. 

 Pulvilli of fore tarsi distinctly enlarged. 17. 



14. Pulvilli not at all enlarged ; thorax with a violet vitta. 



13, caerulescens Loew. 

 Fore pulvilli slightly enlarged; thorax without violet. 15. 



15. Hind metatarsi with a long erect bristle below. 



15, simplex Aid. 

 Hind metatarsi without such a bristle. 16. 



16. Thorax with a coppery vitta. 14, vittatus n.sp. 

 lliorax without a vitta. 16, alienus n.sp. 



17. Palpi much enlarged. 18. 

 Palpi normal. 19. 



18. Palpi as long as the face ; face not unusually wide ; tibiae 



black. 32, palpiger Wh. 



Palpi about half as long as the face ; face very wide ; tibiae 



yellow. 33, triangulatus n.sp. 



19. Cilia of the tegulae pale. 20. 

 Cilia black. 32. 



20. Face with yellow pollen. 21. 

 Face with white pollen. 22. 



21. Face with course pollen; third antennal joint large, kidney- 



shaped. 17, ranterbergi Wh. 



Face green with thin pollen along the sides ; third antennal 



joint of moderate size. 18, albiciliata n.sp. 



22. Third antennal joint subquadrate but may have a short 



point at upper corner. 31. 



Third joint rounded or with a point at tip. 23. 



