NO. 2115. NEW NEOTROPICAL MUSCOTD FLIES— TOWN SEND. 435 



OOMEIGENIA CHOSICA, new species. 



Length of body, 5.5 mm.; of wing, 4 mm. One female, Chosica, 

 Peru, April 21, 1914, on foliage (Townsend). 



Blackish; parafrontals, parafacials, and ocellar area silvery-cine- 

 reous with faint suggestion of brassy; facial plate and faciaha silvery- 

 plumbeous, second antennal joint thinly silvery. Palpi yellowish- 

 salmon color, their bases shghtly infuscate; occiput plumbeous, thinly 

 silvery. Thorax and scutellum thinly silvery, the mesoscutum with 

 four ill-defined vittae of usual pattern. Abdomen with bases of 

 second to fourth segments broadly silvery, the fasciae fading out 

 gradually on their posterior borders, that on second segment nar- 

 rowest. Femora very faintly poUinose. Wings clear, very faintly 

 infuscate on costobasal portion. Tegulae pearl-tawny, the front 

 scale more whitish. 



Holotype.—Csit. No. 19456, U.S.N.M. TD 4232. 



CHRYSOEXORISTA, new genus. 



Genotype. — Chrysoexorista viridis, new species. 



Female front at vertex about one-fourth of head-width, that of 

 male nearly one-third same; proclinate oceUars present; outer ver- 

 tical vestigial in male; two reclinate fronto-orbitals in both sexes, 

 two proclinate in female. Frontals descending as low as origin of 

 arista, three or four below base of antennae and three above. Eyes 

 thickly hairy. Faciaha bare except a few bristles next vibrissae, 

 which are level with the flared edge of epistoma. Second antennal 

 joint short; tliird reaching to the epistoma, subequilateral, a httle 

 longer in male than in female. Facial depression wide, moderately 

 deep. Parafrontals clothed with microscopic short hairs, parafacials 

 bare. Cheeks about one-fourth eye-height in both sexes. Proboscis 

 short and fleshy; palpi stout, curved. Three sternopleurals ; four 

 postsuturals in male, three in female which is -probably abnormal; 

 three postacrostichals in male, four in female hkewise probably 

 abnormal; three lateral scutellars, weak apical pair and separated 

 discal pair in both sexes. Both sexes with short median marginal 

 pair of bristles on first and second segments, and short median discal 

 on second and third segments; marginal row of longer and stronger 

 ones on third segment, and marginal and discal rows on fourth. 

 Hind tibiae of male weakly cihate, with longer bristle; those of 

 female weakly pectinate. Claws of both sexes equal, hardly as long 

 as last tarsal joint. Apical cell open, ending a Uttle before wing tip; 

 cubitus rounded, about as far from hind margin as half length of hind 

 crossvein, latter nearer cubitus which is without stump or wrinkle. 



CHRYSOEXORISTA VIRIDIS, new species. 



Length of body, 8 to 9.5 mm.; of wing, 7 to 8.75 mm. One male 

 and one female, Casahuiri San Gaban canyon, montanya of southern 



