352 KANSAS UNIVERSITY SCIENCE BULLETIN. 



5. Body black; the female with dense yellow pile, her tarsal claws 



simple; the male with dense hair on the legs, his tarsal claws 

 trifid. The wing with its radius three branched. Length 3 to 



4.5 mm hirtipes 



"Body gray, legs reddish gray, feet black; length 3 mm." This is 

 said by Mr. Coquillet to be the same as pecuarum Riley. 



inveimstum. 



6. Males, eyes contiguous 7 



Females, eyes separated by a distinct line 8 



7. Thorax velvety black; legs reddish with black tarsi. Length 1..5 to 



2 mm. Compare here also bracteatuvi (male) , "with legs wholly 

 brown" nwridionale 



Thorax brownish black; legs usually pale; tip of tarsi not black. 

 Length from 2 to 4 mm pecuarwin 



8. Thorax with silvery- white pubesence; legs brownish black, covered 



with whitish hairs. A small variety (less than 2 mm. long) 

 fi'om New Mexico has been named occidcntale Town. (q. v.) 



meriodionalc 



Thorax with yellow hairs; legs reddish brown, covered with yellow 



hairs; tip of tarsi blackish pecuarvin 



9. Male, eyes contiguous Ill 



Females, eyes separated 20 



10. "Mesonotum wholly velvet black; gray spot on sides of the second, 



fifth, sixth, and seventh segments of abdomen. Length 1..5 mm." 



bracteatum 

 Metanotum striped, or with grayish or metallic reflections 11 



11. Dorsum of thorax with one or more longitudinal stripes 12 



Dorsum unstriped 11 



12. Thorax with four longitudinal stripes; posterior margin white; 



abdomen black. Sex not given. Cuban species. .quadrivittaUnn 

 Thorax not so marked 13 



13. Front and middle femora and tibiae wholly yellow; center of 



mesonotum with a black vitta, elsewhere gray. Length 1..5 mm. 



Colorado species griseum 



Femora and tibiae wholly or partly brown 13a 



13a. "Femora and front tibae yellow, their apices brown, middle tibiae 

 brown, a yellow ring beyond the base, hind tibiae brown, the ex- 

 treme base yellowish. Mesonotum marked with a narrow median 

 and laterally with a very broad velvet-black fascia." Length 



3 mm. New Mexico virgattim 



Front femora brown, tibiae brown on apical part 136 



136. Mesonotum with two narrow gray stripes (sometimes quite in- 

 distinct) on a velvet-black ground, in which there are scattered 



golden hairs vitfatum 



"Mesonotum marked with a narrow median and slightly wider 

 lateral black vittae." Length 2.5 mm. Missouri glaucwm 



14. Anterior femora yellow. Mexican species 15 



Anterior femora black 17 



