PAUL R. JONES. 283 



men has tlie pile entirely black, while the other one has some yellow 

 pile on the apex of the front and middle femora and base of the 

 front and middle tibise. The yellow pile of the abdomen is chiefly 

 on the second and third segments, a few hairs on the first and fonrth 

 segments. 



25. LAPHRIA Meigen. 

 Liaphria gilva Linne. 



Specimens from War Bonnet Canon and Monroe Canon, Sioux 

 Co., Nebraska. 



26. PKOCT ACANTHUS Macquart. 

 Proclacanlhtis niilberfii Macquart. 



Numerous specimens from Lincoln, Sand Hills and Glen, Sioux 

 Co., Nebraska. 



27. ERAX Scopoli. 

 Eras ciiierascens Bellardi. 



Numerous specimens from Glen and Harrison, Sioux Co., Ne- 

 braska, and Gordon, Sheridan Co., Nebraska. The specimens which 

 I have show considerable variety in the color of the bristles around 

 the ocelli and of the scutellum. They agree with' Williston's de- 

 scription of E. furax better than with Bellardi's description of 

 cinerascens, and when viewing a whole series from the front are 

 much lighter colored than in E. stamineus. The palpi are black, 

 black pilose, with a few white hairs at the base. 



Erax stamineus Williston. 



Numerous specimens from Glen, Sioux Co., Nebraska. The 

 female agrees with the description of the male, except that the 

 ocellar and occipito-orbital bristles are usually white or yellowish- 

 white, dorsum of the thorax yellow poUinose, and bristles of the 

 scutellum white instead of black, as is usual in the male. The abdo- 

 men lacks the silvery pile, but is covered with yellowish-gray pollen 

 and marked like the female of E. cinerascens. Palpi in both sexes 

 are black, with yellow or yellowish white pile. . The females are 

 difficult to separate from the females of E. cinerascens when com- 

 paring individual specimens, but when examining a series the speci- 

 mens of E. cinerascens appear much whiter or grayish, while those 

 of ^. stamineus appear more yello^vish. They can be separated by 

 the difference in the color of the pile on the palpi ; in E. cinerascens 

 it is black, and in E. stamineus yellow or white. Formerly recorded 

 from two males from Montana. 



TRANS. AM. KNT. SOC. XXXIII. AUGUST, 1907. 



