AMERICAN DIPTERA. 379 



posterior angles of segments 2-6 grayish pruinose; the grayish pile 

 confined chiefly to the sides and venter. Legs wholly black, wholly 

 grayish pilose and with weak bristles; fore tibiae with a terminal claw- 

 like spur; the middle tibia; with a stout spine at tip, claws black. 

 Wings nearly hyaline, with clouds as above mentioned. All the mar- 

 ginal and submarginal cells wide open, the anal cell open; the anterior 

 vein beyond the middle of the discal cell. 



Type. — Type series consists of three females and three 

 males, co-types, located as follows: two females in the collec- 

 tion of Prof. C. W. Johnson; two males in the collection of 

 Massachusetts Agricultural College, and one male and one 

 female in the collection of the Colorado Agricultural College. 



Habitat.— -Denver (Apr. 29), and Ft. Collins (March 22, 

 April 30), Col.; Montclair, Cal. 



Mr. Coquillett's cristata and fallei are very similar, but the 

 bristles of the scutellar margin will at once separate them, as 

 cristata is described as having four, while fallei has many, 

 bristles. I believe that it is to this species that Mr. Jones 

 refers in Trans. Am. Ent. Soc, Vol. XXXIII, page 280. 



Coplmra bella. 



Blax bellus Loew, Cent., V, 24, 1872. 



$ 9- — Length 6-9.8 mm. — ff. — Reddish species; the face and front 

 and two large spots (when viewed from before) on the thoracic dorsum 

 between the geminate stripe and the humeri, silvery-white pruinose. 

 Abdomen and legs reddish; wings dark, with a clear spot on the outer 

 costal margin. 



Face and front as above, wholly bare; mystax, pile on basal seg- 

 ments of the black antennae, ocellar tubercle and occiput, yellowish- 

 white. Occiput grayish-yellow pruinose except on occipital orbits, 

 where it is white. Proboscis black; first segment of antennae cylin- 

 drical, second segment shorter, more rounded, third segment some 

 longer than the basal segments taken together, fusiform; style rather 

 thick, tapering to a point, about one-half the length of the third seg- 

 ment. Thorax obscured with brownish bloom; dorsum with geminate 

 median stripe, indistinctly divided, and the two lateral stripes broad, 

 much abbreviated before and behind and subdivided by bloom at the 

 transverse suture, brownish-black; two silvery spots on anterior por- 

 tion of the dorsum as mentioned above, very distinct when viewed from 

 before. Pleurae densely brownish pruinose; front coxae and spot above 

 and a similar spot above the hind coxae, whitish pruinose. The very 

 sparse pile and bristles reddish-yellow. There are two scutellar bris- 

 tles. Halteres yellow. Abdomen polished red, rather slender; from 



TRANS. AM. ENT. SOC, XXXV. SEPTEMBER, 1909 



