NO. 2115. NEW NEOTROPICAL MUSCOID FLIES— TOWNSEND. 421 



fasciae narrow obliquely off laterally on front corners, and the 

 mesoscutal vittae narrow off on inner hind corners. Abdominal 

 fasciae with faint indication of bloom, which slightly dulls their 

 luster. Pleurae and venter paler, brassy-silvery. Femora fulvous 

 except tips, tibiae faintly reddish on middle, rest of legs velvet-black. 

 Wings faintly smoky-tinged throughout. Tegulae pale yellow, pearly. 

 Holotype.—C?it. No. 19441 U.S.N.M., female. TD 4207. Allo- 

 type, male. Paratype, male, TD 4208. 



LACHNOMMOPSIS, new genus. 



Genotype, — Lachnommopsis armata, new species. 



Differs from description of Lachnomma as follows: Male only- 

 Oral profile nearly or quite as long as frontal, the epistoma being 

 much produced and occiput swollen below. Vertex one-third of 

 head-width or slightly more, face below nearly one-half head-width. 

 Very closely-set row of downwardly-inchned bristles on parafacials, 

 beginning just inside line of frontals near end of same and extending 

 to point on level with lower end of eye, closely approximated to 

 faciaha. Parafacials about one-fifth as wide as facial plate. Cheeks 

 hardly one-third eye-height. Vibrissae inserted well above extreme 

 oral margin, though latter varies with wrinkling. Eyes descending 

 to bend of faciaha, at which point the cilia of facialia stop. Antennae 

 inserted far above eye-middle; third joint about four times as long 

 as the shghtly elongate second, perfectly straight and equilateral, not 

 very wide. Arista thickened three-fourths or more to tip. Pro- 

 boscis not as long as head-height; palpi subfihform, not thickened at 

 tip. Claws only a Httle elongate, the front ones more so than others. 

 Abdominal macrochaetae only marginal, even on anal segment. 

 Third vein spined halfway or so to small crossvein. Apical ceU very 

 narrowly open, almost closed in margin, ending conspicuously but yet 

 only a little before wingtip. 



LACHNOMMOPSIS ARMATA, new species. 



Length of body, 5.5 to 7 mm. ; of wing, 4 to 5.5 mm. Four males, 

 Chosica, Peru, 2,800 feet, indoors; one January 20, two May 25, and 

 one July 17, all 1913 (Townsend). 



Blackish, thickly cinereous pollinose, upper parts including para- 

 frontals with faint brassy tinge to the pollen. Antennae and arista 

 black, the second antennal joint more or less rufous. Palpi fulvous. 

 FrontaUa brownish, poUinose. Thorax with four moderately narrow 

 nearly equal blackish vittae, the outer ones of the semicolon type, a 

 linear median one behind suture. Abdominal tergum marmorate. 

 Legs black. Wings clear, bases pale yellowish. Tegulae tawny- 

 whitish. 



Holotype—C&t. No. 19442, U.S.N.M. TD 4163. 



