NO. 1935. MU8C0ID FLIES FROM SOUTH AMERICA— TOWNSEND. 337 



frontalia brown. Antennae reddish-yellow, the third joint mostly 

 brownish except base. Arista brownish, sometimes lighter on base. 

 Palpi pale reddish-yellow. Pleurae thickly silvery-gray polluiose; 

 mesoscutum and sciitellum same with a faint golden shade, former 

 with four deUcate but distinct black vittse, outer ones interrupted at 

 suture. Abdomen with the second, third, and fourth segments 

 thickly silvery with faint golden tinge, the hind margin for about 

 one-third of width of each segment being shining brown. Reddish 

 ground color of abdomen shows on sides. Pollen extends on venter. 

 Fu'st abdominal segment brownish. Legs reddish-yellow to reddish- 

 brown, tarsi dusky. Wings clear. Tegulse white. 



Type.— CM. No. 15176, U.S.N.M. TD 4013,/. r. s. 



Cotype, TD 4012, ch. 



Genus OMMASICERA Townsend, 

 Ommasicera Townsend, Ann. Ent. Soc. Amer., vol. 4, 1911, p. 145. 



General external characters of Carcelia, but apical cell ending just 

 a little before wingtip. Eyes thickly short-hairy. Facialia bare 

 save a few bristles above vibrissse, latter on level with oral margin 

 which is cut off and only slightly prominent. Front of female in 

 middle equal to width of one eye, front and face evenly but slightly 

 widening below from vertex. Cheeks narrow, not over one-eighth 

 eye-height, the eyes descending almost to vibrissse. Female with 

 two proclinate orbital bristles and two recUnate ones inside these, the 

 liindmost one weaker. Pair of proclinate ocellar bristles which are 

 weaker than the strong orbitals. Second antennal joint short, tliird 

 in female about four times as long as second; arista long, practically 

 bare, tliickened on basal one- third, basal joints short. Proboscis 

 short and fleshy, palpi elongate and slightly thickened apically. 



Three or four sternopleural bristles, the middle one or two very 

 weak. Four postsutural bristles, the posterior one much stronger 

 than the others. Tliree lateral pairs of scutellar bristles, the middle 

 one weaker; a very delicate suberect apical pair curved forward, a less 

 delicate discal pair. First abdominal segment with a median mar- 

 ginal pair of short macrochsetse, second with short median discal and 

 marginal pairs, third with short median discal pair and marginal 

 row of eight long ones, anal segment wdth discal and marginal rows of 

 moderately long ones. Claws of female quite short, hind tibiae 

 subpectinate with sparse short bristles among which is a long one 

 near middle. Apical cell narrowly open a very little before actual 

 wingtip; fourth vein bent roundedly at right angle, its last section 

 deeply and evenly bowed in, no stump or wrinkle at bend; hind cross- 

 vein nearer to bend of fourth. 



48702°— Proc.N.M.vol.43— 12 22 



