March, 1898.] CoQUILLETT : DESCRIPTIONS OF OsCINID/E. 47 



dian, longitudinal carina on lower half of the triangle sides of triangle converging to 

 lower end of front, pointed at the apex, sides of front bearing short black bristly 

 hairs ; third joint of antenna; orbicular, slightly longer than wide. Thorax yellow, 

 five dorsal vittae and two spots on the pleura, reddish yellow ; scutellum light yellow, 

 flattened. Abdomen black, the ends, sides and venter yellow. Legs reddish yellow. 

 Halteres light yellow. Wings hyaline, the hind crossvein slightly more than its length 

 from the small. Length, 3 mm. 



Two specimens. Colorado (H. K. Morrison), and Placer Co., 

 Cal., in August (A. Koebele). Type No. 3S01, U. S. Nat. Museum. 



Chlorops graminea, sp. nov. 



Head yellow, an ocellar spot, one on lower part of the triangle, the third anten- 

 nal joint, thickened base of arista and two vittae on the occiput, black, sides of triangle 

 partly or wholly brown, terminal portion of arista white ; frontal triangle opaque, 

 punctured, bare, the sides converging to lower end of front, the apex broadly rounded, 

 sides of front bare ; third joint of antennae orbicular, slightly shorter than wide. 

 Thorax yellow, opaque, five dorsal vittae and three or four spots on the pleura, black - 

 scutellum convex, yellow, toward the sides brown. Abdomen black, the narrow hind 

 margin and sides of each segment, and middle of venter, yellow. Legs reddish yel- 

 low, apices of femora, both ends of the tibiae, and bases of the tarsi, light yellow, 

 Halteres yellow. Wings hyaline, hind crossvein slightly more than its length from 

 the small. Length, 3 mm. 



Two specimens, Lancaster, Cal. Bred by A. Koebele. Type No. 

 3802, U. S. Nat. Museum. 



Chlorops pullipes, sp. nov. 



Head yellow, the frontal triangle, antennae including the arista, the clypeus, 

 palpi and occiput except the sides and lower part, brown or black ; frontal triangle 

 polished, the sides converging to lower end of front, sides of front bare ; third anten- 

 nal joint subquadrate, slightly longer than wide. Thorax polished, the dorsum black, 

 sometimes marked with two yellow vittae, pleura yellow, marked with four black 

 spots ; scutellum yellow, flattened. Abdomen black, hind margins of the fourth 

 (usually) and fifth segments yellow. Legs brown or black, the trochanters, apices of 

 femora, both ends of tibiae, and bases of tarsi, yellow. Halteres yellow. Wings 

 hyaline, hind crossvein slightly more than its length from the small. Length, 2 to 4 

 mm. 



Sixteen specimens. Santa Fe, N. Mex. (T. D. A. Cockerell, in 

 July and August), and Canon City, Colo. (H. F. Wickham); other 

 specimens from Colorado were collected by C. F. Baker and H. K. 

 Morrison. Type No. 3803, U. S. Nat. Museum. 



Chlorops assimilis Macq. An examination of the type of Siphoti- 

 ella obesa Fitch proves that it is a synonym of the above mentioned 

 species. Chlorops trivialis Loew and C. bistriata Walker belong in 

 the same category. 



