58 ENTOMOLOGICAL NEWS. [Feb., '07 



in size, and is frequently entirely lacking-, so that this character 

 cannot be depended upon to separate ivootonac from perpallida. 

 However, perpallida has the second submarginal cell more nar- 

 rowed above and is of a paler color generally, lacking the 

 greenish tinge to the scutellum, metathorax and pleura which 



o o 



makes these parts contrast with the mesonotum and vertex in 

 ivootonac. The two are very close and may not be specifically 

 distinct, but the difference in the flowers visited would argue 

 for their separation. 



19. Perdita zebrata Cresson. 



Glen, Crawford, Bridgeport and Gering, Nebraska, July 28 

 to August 22, at flowers of Clcoinc serrnlata, HcliantJius petio- 

 laris and Solidago inissoitriensis. On. close examination of a 

 series of nearly 200 specimens the supposed- external distinc- 

 tions between P. zebrata and P. bakerae break down; the geni- 

 talia characters have not been further investigated. 



20. Perdita stottleri flavida n. subsp. 



?. Length, 7 mm. Similar to P. stottleri, but larger, with the light 

 parts ot the abdomen canary yellow instead of cream color, the dark 

 parts of the head and thorax sen eons green instead of bluish green, 

 and the hind femora entirely yellow, lacking the large black mark of 

 typical stottleri. 



J 1 . Differs from the <$ of stottleri by the aeneous green instead 

 of bluish green color of the head and thorax and the presence of a black 

 mark on the hind tibiae. 



Type : Glen, Sioux County, Nebraska, August 22, 1906, on 

 Gnticrrezia sarothrac (L. Bruner), 9, $. 



Paratypes: Type lot, 355 and 2 $ $ ; type locality, 

 August 17, 1906, on Solidago uiissouricusis (P. R. Jones, i 



This subspecies is quite near to P. stottleri Ckll., which was 

 described from Tularosa Creek at edge of Mescalero Reserva- 

 tion, New Mexico, and which also visits Gitticrrczia, but differs 

 from the type as above, apparently representing a valid sub- 

 species. 



Of the above twenty species, eleven have their type localities 

 in Nebraska, five were originally described from New Mexico, 

 three from Colorado, and one from Xew Mexico and Colorado. 

 There are also before us five unique male Perditas from 

 Nebraska, some of which are apparently new, but their naming 

 is deferred until the accumulation of additional material. 



