56 ENTOMOLOGICAL NEWS. [Feb., '07 



12, abundant on Solidago rigida and Grindelia squarrosa, es- 

 pecially the former. 



9. Perdita cockerelli Crawford. 



Lincoln, West Point, Broken Bow and Sioux County, Ne- 

 braska. In Sioux County it flies during August or longer, vis- 

 iting the flowers of Solidago niissoiiricnsis. In eastern Nebraska 

 it flies from August 6 to October 6, almost exclusively on 

 Grindelia squarrosa, but also, rarely, on Aster late in the sea- 

 son. This species is not nearly so common as bruneri, which it 

 so much resembles. 



10. Perdita crawfordi Cockerell. 



Lincoln, Nebraska, August 22 to September 1, abundant at 

 flowers of Grindelia squarrosa, rarely straying to Helianthus 

 annuits also. Strangely, this species has never been taken 

 away from the environs of the salt flats west of Lincoln. 



11. Perdita ignota Cockerell. 



No additional specimens of this species have been captured 

 since the one recorded from Lincoln in September, in Ent. 

 News, viii, p. 24. It has been taken by Messrs. C. R. Jones and 

 W. D. Pierce at Clarendon, Texas, at flowers of Grindelia 

 squarrosa. 



12. Perdita punctata Cockerell. 



Also known from Nebraska only through the one 9 speci- 

 men captured at Lincoln in September, and recorded with 

 ignota. 



13. Perdita maura Cockerell. 



Lincoln, West Point and Cedar Bluffs, Nebraska, July 27 to 

 October 1 ; at flowers of Physalis, and, late in the season, on 

 Aster. 



14. Perdita gutierreziae Cockerell. 



Four females and twenty-four males collected August 18 to 

 22, 1906, at flowers of Gutierrczia sarothrae at Glen, Sioux 

 County, Nebraska. The female of gutierreziae has never been 

 described, and is exceedingly similar to P. rhodura Cockerell, 

 but the male of rhodura is quite distinct from that of gutier- 

 reziae. 



