NO. 2115. NEW NEOTROPICAL MUSCOID FLIE8—T0WNSEND. 433 



Thorax, scutellum, and abdomen thickly polhnose with pale brassy- 

 silvery; mesoscutum showing four well-marked vittae, the inner pair 

 a little narrower and shorter than the outer. Abdomen submar- 

 morate, a median vitta and pair of large spots showing more or less 

 distinctly on segments two and three. Wings nearly clear, only 

 very faintly tinged with fuscous, stigma smoky-yellowish. Tegulae 

 waxy-yellowish, the front scale whitish anteriorly. 

 Holotype—Csit. No. 19454, U.S.N.M. TD 4097. 



ACEMYIOPSIS, new genus. 



Genotype. — Acemyiopsis punensis, new species. 



Differs from Acemyia as follows: Female with four orbital bristles 

 on each side. Cheeks of female less than one-fourth eye-height. 

 Eyes practically bare, but furnished with very short sparse barely 

 distinguishable hairs. Third antennal joint hardly over one and 

 one-half times second. Arista thickened on basal fourth. Front of 

 female as wide as eye, face conspicuously widening. Strong pro- 

 clinate pair of ocellar bristles. No outer vertical bristles in female; 

 inner ones long and not decussate, straight. Proboscis short. Eyes 

 of female descending hardly short of vibrissae, which are removed 

 from oral margin. Frontal bristles descend very Httle below base 

 of second antennal joint. Palpi sybcyhndrical, short, shghtly flat- 

 tened, surmounted by several strong short bristles. Two sterno- 

 pleurals and three postsuturals. Scutellum with strong decussate 

 apical pair of bristles, and two long lateral pairs. No discal macro- 

 chaetae on abdomen. A median marginal pair on first segment, and 

 one lateral marginal. Second segment with four long median mar- 

 ginal, then two short bristly hairs on each side of these, then one 

 long lateral. Third and fourth segments with marginal row of long 

 macrochaetae. All the macrochaetae of abdomen and thorax are 

 long, the anterior supra-alar and anterior postalar being the longest 

 and strongest of the thorax and well curved. Claws of female as 

 long as last tarsal joint. Apical cell very short-petiolate, ending far 

 before wingtip. 



ACEMYIOPSIS PUNENSIS, new species. 



Length of body, 6 mm.; of wing, 4.75 mm. One female, Oroya, 

 Peru, over 12,000 feet, on short herbage in Rio Mantaro Valley, 

 March 6, 1913 (Townsend). 



Black. Facial plate and parafacials frosted-silvery, parafrontals 

 and ocellar area golden. Frontaha very dark brown. Second anten- 

 nal joint and palpi clear rufous, third joint and arista black. Occiput, 

 mesoscutum, pleurae, scutellum, and abdomen thickly poUinose with 

 dull Hght golden. Four narrow thoracic vittae, the outer ones of 

 the semicolon type. Legs black, femora and tibiae pale brassy poUi- 

 81022°— Proc.N.M.vol.49— 15 28 



