ART. 23 TWO-WINGED DOLICHOPODID FLIES VAN DUZEE 5 



7. Hind femora without black at tip, at most the tip is only slightly brownish 



above 8 



Hind femora distinctly blacliened at tip, at least above 12 



8. Hind tarsi almost wholly yellow; first joint distinctly longer than 



second 9 



Hind tarsi partly or wholly black, first and second joints of nearly equal 

 length 10 



9. Second joint of hind tarsi about two-thii'ds as long as first. 



25, calcitrans Loew. 

 Second joint of hind tarsi less than half as long as first. 



4, angustata, new species. 



10. First joint of hind tarsus blackish at tip only, second usually yellowish at 



base 21, californica, new species. 



Hind tarsus almost wholly black 11 



11. The portion of the face below the suture nearly as long as wide. 



3, cylindrica Loew. 

 Portion of face below the suture about half as long as wide. 



14, bimaculata, new species. 



12. First joint of hind tarsus nearly twice as long as second. 



8, nigriventris, new species. 

 First and second joints of hind tarsus of nearly equal length 13 



13. Abdomen bright shining green, almost without pollen. 



6, barbipes, new species. 

 Abdomen dulled with grayish pollen, at least on the sides 14 



14. Apical third or more of hind tibiae black 1, nigripes Loew. 



Not over apical fourth of hind tibiae infuscated, and only brown, not black. 



10, femoralls, new species. 



15. Scutellum with hairs on its disk 16 



Scutellum bare, except for the usual marginal bristles 17 



16. Thorax with a little snow-white pollen ; scutellum with only a few hairs on 



its disk ; yellow spots on second abdominal segment distinct. 



17, albicans Loew. 

 Thorax with thick brownish pollen ; disk of scutellum with many conspicu- 

 ous hairs; yellow spots on the second abdominal segment very indistinct. 



12, robusta Johnson. 



17. Antennae yellow, third joint very narrowly black above. 



30, flavicornis, new species. 

 Antennae wholly black or brown 18 



18. Hind tarsi wholly black, or very nearly so 19 



Hind tarsi wholly yellow, or only slightly darker at tip 23 



First joint of hind tarsus yellow with a black tip 25 



19. Second joint of hind tarsus considerably longer than the first. 



27, aldrichi Johnson. 

 First and second joints of hind tarsi of nearly equal length 20 



20. Hind margin of the pleurae yellow 23, calceata Loew. 



Hind margin of the pleurae blackish 21 



21. Second and third abdominal segments yellow with their hind margins black. 



IS, thoracica, new species. 



Yellow of the abdomen confined to a rather small spot on each side of the 



second segment ; sometimes there are indistinct spots on the sides of the 



third segment also 22 



22. Tip of hind tibiae narrowly blackened 19, currani, new species. 



Hind tibiae black at tip for one-fourth their length. 



22, sericata, new species. 



