ADAMS ; NORTH AMERICAN DIPTERA. 455 



the apex of discal cell, distal portion of third vein nearly- 

 straight, ending slightly before apex of wing. Length, .8-. 9 mm. 

 Numerous specimens; Las Cruces, N. M. 



Limosina occidentalis, n. sp. 



Male : Head shining, vertex and lower part of face black, 

 remainder with a brownish cast, antennse dark brown, second 

 joint with a coronet of strong bristles, arista pubescent. 

 Thorax shining dark brown, pleurae obscurely marked with 

 yellow, halteres whitish. Abdomen brownish black, apex 

 black, shining. Coxse and legs brownish yellow, shining, tarsi 

 yellow. Wings hyaline, anterior portion, except a triangular 

 space beyond apex of second longitudinal vein, and narrowly 

 along fifth vein, infuscated, third section of costa longer than 

 second, distal section of second vein longer than first section of 

 third, joining costa slightly beyond the apex of discal cell, 

 third vein straight, ending near apex of wing. Length, 

 1.75 mm. 



One specimen; Palo Alto, Cal. Collected by R. W. Doane. 



Limosina sordipes, n. sp. 



Male and female : Front opaque black, occiput, vertex, face 

 and cheeks shining black, mouth-parts and antennae black, 

 arista pubescent. Thorax black, mesonotum and scutellum 

 subopaque black, pleurae obscurely marked with yellow, knobs 

 of halteres brownish. Abdomen shining brownish black, pos- 

 terior margins narrowly light brown. Coxae and legs brown- 

 ish, tarsi yellowish. Wings hyaline, subfuscous on anterior 

 portion, most marked on second and third longitudinal veins, 

 third section of costa longer than second, distal section of sec- 

 ond vein longer than the first section of third vein, joining costa 

 slightly beyond apex of discal cell, third vein nearly straight, 

 ending slightly before apex of wing. Length, 1-1.4 mm. 



Numerous specimens; Brookings, S. Dak. 



