284 DIPTERA FROM SOUTHWESTERN UNITED STATES 



1902; one female, same locality, May 31, 1902; one female, 

 Alamogordo, New Mexico, May 8, 1902. 



Coenosia basalis Stein 



1897. Dexiopsis basalis Stein, Berl. Ent. Zeit., xlii, 259. 



This species was originally described by Stein as a Dexiopsis, 

 but it does not belong to that genus, having but one pair of pre- 

 sutural dorso-centrals, the hypopygium very small, and the sixth 

 vein not longer than in normal Coenosia species. 



If I am correct in my interpretation of the limits of the species 

 it is quite variable in color, the palpi and front coxae being some- 

 times entirely dark, and varying to entirely pale, while the mid 

 and hind femora are usually conspicuously blackened at apices 

 and vary to entirely 3'ellow. The abdomen is sometimes con- 

 spicuousl}^ 3^ellow at base, but in the specimens from New Mexico 

 the color is entirely gray and the lateral spots on dorsum are 

 absent. There is a constancy in chaetotaxy, and other charac- 

 ters, that forces me to the conclusion that I have before me not 

 several species, but one which is variable in color. 



From other species in the genus, hasalis maybe readily separated 

 by the presence of a long postero-dorsal bristle at middle on hind 

 tibia, and by the rather short stout abdomen, which has usually a 

 central vitta and paired spots on dorsum, while the fifth sternite 

 is short, with a shallow central incision and is normally almost 

 entirely hidden. 



Localities: Alamogordo, New Mexico, April 8 and 22, and May 

 3, 1902; Cloudcroft, New Mexico, June 18, 1902, two males, 

 two females. 



Coenosia setigera sp. n. 



Male. — Black, denseh' pruinescent. Head black, interfrontalia opaque 

 black, ocellar triangle and orbits brownish gray pruinose, face, facial orbits, 

 and cheeks with white pruinescence; antennae black; palpi brown. Thorax 

 slightly shining, without vittae. Al)domen with a pair of faint brown ppots 

 on dorsum of segments two, three and four which are very large, and con- 

 tiguous or almost so centrally, so that the dorsum appears to have a broad 

 broAvn central vitta posteriorly; fifth sternite and hypopygium black. Legs 

 j^ellow, mid and hind coxae grayish, tarsi black. Wings clear, veins dark 

 brown. Cah'ptra white. Halteres yellow. 



Frons almost twice as long as wide and nearly one-third the \^idth of head; 

 ocellar triangle short, not extending to middle of frons; orbits narrow, about one- 

 fourth as wide as interfrontalia, the bristles very long, four in mmber, with 



