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 tibife 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. Colhns (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. — -f. — 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 antennas, ocellar tubercle and occiput, yellowish- 

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

 where it is white. Proboscis black; first segment of antennas 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. Pleuras 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 



