Feb., '07] ENTOMOLOGICAL NEWS. 55 



ruptcd hand, these marks sometimes entirely absent. Venter hlack. 

 Cheeks, occiput, pleura, legs and last three abdominal segments with 

 long, erect, pure white hair, the clypeus, face and mesonotum with 

 shorter and thinner pubescence. 

 d. Unknown. 



Type: Warbonnet Canon, Sioux County, Xel)raska, July 23, 

 1901, on Hcliunthits (M. A. Carriker, Jr.), I ?. 



I'aratypes: Niobrara, Nebraska, August 13, 1902, on 

 Hclianthns (W. D. Pierce), 2 9 . 



The three specimens placed here differ widely in their face 

 and abdominal markings, but on close study prove to be but 

 variations of a single very distinct species, characterized by the 

 long head, which is suggestive of Conanthalictus. The type has 

 well-developed face marks and abdominal marks, but one of the 

 paratypes completely lacks all trace of face markings and has 

 even better developed abdominal marks than the type, while 

 the other paratype has the face marked like the type, but lacks 

 any abdominal marking. 



6. Ferdita fallax Cockerell. 



This species has been taken only in Sioux County, where it 

 flies from June 27 to August 19, visiting a small species of 

 Hclianthns and also, though less commonly, Gutierrezia saro- 

 thrac. A series of 14 females and 15 males was collected in 

 Warbonnet Canon, July 12, 1901, on a small Hclianthus, and 

 the occurrence of so many at the same time on the same flowers 

 leaves no doubt as to the correct matching of the sexes. The 

 females, while not typical, are so close to falla.r that no separa- 

 tion from that species can be justified, while the males prove 

 to be unquestionably the same as the type of P. crii^cronis Ckll., 

 known only in the male, and described from Mesilla Valley. 

 N. M., at lin^ci-oii, in May. P. eri^cronis Ckll., then, must be 

 considered as the unknown male of P. falla.r Ckll. 



7. Perdita affinis Cresson. 



\\Yst Point, Cedar Bluffs and Nebraska City, Nebraska, 

 August 30 to September 12, uncommon at flowers of Solidago 

 ri -Ida, and, late in the season, on ,-lstcr. 



8. Perdita bruneri Cockerel!. 



Lincoln and West Point. Nebraska, August 6 to September 



