45 



Novenibe 24 (Pratt) ; District of Columbia, July, October 15, November 2 and 

 14 (Pergande); Illinois, September 10, October 10 (Nason); St. Anthony Park, 

 Minn., December 11 (Lugger); Tick Island, Fla.,May 12 (Johnson); Texas 

 (Nat. Mus. ) ; Oneco, Fla., May 26 (Gossard) ; Roanoke, Va., October (Thayer) ; 

 Newport News, Va., October (Thayer); St. Elmo, Va., April, May, June, July 

 (Pratt); New Orleans (Thayer); Sparrows Point, Md.,and vicinity (Thayer 

 and Lazear); ]Middletown, Conn. (Davis). 



THE GENUS PSOROPHORA. 



But one species, P. cillatx, of the genus Psorophora is known in 

 the United States. This is well illustrated in the accompanying 

 figure (tig. 20). Although this insect, as indicated in the synoptic 



KiG. 20. — Psoroplwra cUiata: Female — enlarged (original). 



tables, is really yellowish in color, yet the general effect when one 

 glances at it, or sees it flying, is that it is very dark, almo.st black. 

 The wings are not really spotted or infuscated, but the ver}- numerous 

 dark scales on the main veins make the wings appear dark. They are 

 al.so when seen in certain lights prismatic in color effect. The palpi 

 of the female are nearly half as long as the beak, and the beak itself 



