305 



[Williston. 



«. — Eyes distinctly pilose ^- 



— Eyes bare c- 



5;— Third joint of antennae (J^) small, oval, blackish ; face with sparse 



long pile ; wings not lighter toward the base occideutalis, sp. nov. 



— Third joint of antennae (9) larger, subquadrate, reddish; wings lighter 



toward the base lasiophthalmus, sp. nov. 



c— Scutellum with bristly hairs on its border d. 



— Scutellum without bristly hairs on its border A- 



c?.— Humeri, scutellum, and lower part of the face, luteous ; fiice strongly 



excavated above ; arista pubescent e. 



— Black shining ; arista pilose (except in tristis) /• 



€. —All the femora except the apex black Heucoparea 



— Hind femora, except base and apex, black *pallipes. 



f. — Legs black, knees, base and apex of tibiae and more or less of the 



tarsi, luteous ff- 



— Anterior legs luteous, posterior blackish with the base and apex of 



femora and tibisB and last joints of tarsi luteous plumata. 



.9:— Second and third segments of abdomen, except anterior angles, 



opaque (J*) tristis. 



— Second and third segments of abdomeu wholly shining (cf) 



cyanescens. 

 A.— Abdomen with distinct, entire cross-bands, legs, except the posterior 



femora, red rufipes, sp. nov. 



— Abdomen without metallic bands »> 



*.— Second and third segments of abdomen opaque ((^) ./. 



— Abdomen wholly shining ^• 



j. — Legs black nigripennis, sp. nov, 



— Legs luteous, femora black ^capillata. 



A;.— Legs black comosa. 



— Legs in large part luteous pa?-«a, sp. nov. 



Cheilosia tristis Lw., Cent, iv, 71. British America. Three male speci- 

 mens from Oregon and "Washington Territory agree so closely Avith 

 the description of this species, that I believe it to be the same. I have 

 no other specimens with which to compare them. 

 Cheilosia comosa Lw., Cent, iv, G6. Colorado 1 Red River of the North. 

 The previous remarks will apply equally well to this species. 

 Cheilosia occidentalis, sp. nov. 



J-.. — Frontal triangle black, with black pile, swollen with a depression ; 

 antennae black, third joint somewhat brownish, nearly orbicular, small, 

 arista with scarcely perceptible pubescence. Face shining black with 

 sparse lutescent pile, scarcely concave from base of antennae to tip of 

 tubercle, deeply and shortly concave below the latter. Eyes thickly 

 pilose, lutescent below, fuscous above. Thorax deep green black, with 

 brown or blackish pile, intermingled with shorter lutescent. Abdomen, 

 oval, not at all slender, deep, somewhat metallic green, shining, pile lutes- 



