NO. 1935. MUSCOID FLIES FROM SOUTH AMERICA— TOWNSEND. 327 



vittse, the median one broadest; apex of scutellum yellowish. Disk 

 of abdomen blackish, shining, thinly silvery, the lateral edges and 

 anal segment yellowish and golden pollinose; venter blackish and 

 thinly silvery. In the male the small fifth or hypopygial abdominal 

 segment is reddish-yellow. Legs brown, tibiae slightly reddish. 

 Wings nearly clear, the long veins yellowish. Tegulse nearly white. 

 Type.— C&t. No. 15165, U.S.N.M. Female; TD 4059. 



VIBRISSOMYIA, new genus. 



General characters of the Mcropalpine flies. Eyes bare, female 

 vertex fully one and one-half times width of one eye, of male about 

 eye-width. Face rapidly broadening from front. Cheeks about equal 

 to eye-height in both sexes, clothed with sparse bristly hairs which 

 extend on parafacials and parafrontals. Facial plate having rather 

 a swollen or inflated appearance, feebly carinate above, the epistoma 

 projected straight forward in a wedge-shaped production fully equal- 

 ing length of second antennal joint. Vibrissse barely distinguishable 

 from the strongly vibrissiform peristomal bristles below them, being 

 only slightly longer; faciaha ciHate as far as ptiUnal suture with 

 shorter vibrissiform bristles usually three or four in number, these 

 meeting both suture and peristomalia (peristomal row) almost at 

 right angles, the facialia being abruptly bent inward below. Male 

 with two pairs (exceptionally with an adventitious tliird pair) of 

 recHnate orbitals next to frontaUa, and two divergent pairs outside 

 these; female with same and three prochnate orbitals in Hne with the 

 two divergent ones. Inner vertical bristle long and decussate; outer 

 vertical bristle nearly same strength but not quite so long, strongly 

 cUvergent. A pair of divergent prochnate long ocellar bristles. 

 Frontal bristles descending below base of antennae at a widely diver- 

 gent angle. A second nearly straight row of weaker frontal bristles 

 outside, comiecting ends of the inner bent row. Parafacials in both 

 sexes as wide as or \vider than length of second antennal joint, with 

 a row of two to five strong facio-orbital macrochastae with weak 

 bristles more or less interspersed. Second antennal joint elongate; 

 the third in female about same length as second, moderately mdened 

 and obhquely truncate at end; in male the thu'd joint is considerably 

 longer than second joint, greatly widened and obhquely truncate 

 a^pically (not in Vihrissomyia licolor). Ai'ista stout, bare, subgeni- 

 culate, apical one-third slender, second joint long. Proboscis awl-like, 

 very long, slender, and horny, part below geniculation longer than 

 either height or length of head. Palpi absent. 



Three strong sternopleural bristles; three postsutural bristles, some- 

 times a weak fourth. Two strong lateral scutellar pairs, two weak 

 lateral pairs, one weak decussate apical pair, one weak discal pair. 

 No median bristles on first abdominal segment, a median marginal 



