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, side? 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. 3801, 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 vitUe, 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. Iv. 
Morrison. Type No. 3803, U. S. Nat. Museum. 
Chlorops assimilis Macq. An examination of the type of Siphon- 
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. 
