828 PR00EEDINO8 OF THE NATIONAL MUSEUM. vol.43. 



pair on second, third with eight strong marginal; anal with submar- 

 ginal and terminal shorter bristles thickly interspersed with erect 

 bristly hairs especially in male. Male hypopygium greatly developed, 

 often strongly exserted. Claws of female long, about as long as last 

 tarsal joint; those of male nearly twice as long, longest on front feet. 

 Hind tibise with irregular bristles. Legs strongly spined, especially 

 middle tibiee. Apical cell open far before wingtip, fourth vein with 

 wrinkle at end, hind crossvein nearer to apical crossvein. 



Reproductive habit, leaf-larviposition ; strap like uterus, developing 

 colored maggots almost certainly. 



Type-species. — Vibrissomyia lineata, new species. 



VIBRISSOMYIA LINEATA, new species. 



Length of body, 9.5 to 13 mm.; of wing, 7.5 to 10.5 mm. Three 

 females and nine males, Tirapata, Peru, high puna of the Lake Titi- 

 caca region, about 13,000 feet, January 28, 1910, on flowers of dwarf 

 species of Hypocharis,. 



Parafrontals very dark, shining blackish, thinly silvery poUinose, 

 the pollen showing thickly in some lights. Entire face and cheeks 

 luteous, silvery-white pollinose except the produced portion of clypeus 

 and peristoma. FrontaHa reddish-brown, first two antennal joints 

 yellowish-red, third joint and arista dark brown, proboscis shining 

 black or dark brown. Occiput ashy, with pale golden to grayish pile. 

 Pleurae and mesoscutum only very faintly silvery pollinose, latter with 

 four faint vittse of the usual pattern. Scutellum wholly pale yellowish- 

 brown. Abdomen shining brown to blackish, with a distinct median 

 line of pollen in both sexes; the first three segments of male more or 

 less reddish, sometimes broadly rust-yellow or reddish-ocher, but in 

 most males only faintly lighter on sides of second segment or wholly 

 blackish. Legs black, claws black, pulvilli fuscous. Wings very 

 faintly infuscated throughout, almost clear, the veins yellowish. 

 TegulsB whitish to watery, often with a smoky tinge, especially on 

 front scale. 



Type.—Gsit. No. 15166 U.S.N.M. Female. 



VEBRISSOMYIA BICOLOR, new species. 



Length of body, 12 to 13 mm.; of wing, 9.5 to 10 mm. Two males 

 with preceding species. 



Differs from V. lineata as follows : Pile of occiput faintly to deeply 

 golden. No median pollinose line on abdomen. First, second, and 

 third abdominal segments entirely yellowish-red excepting only a 

 broad median vitta of black above, and a vitta of black below border- 

 ing ventral plates. Tegulee deeply fuscous throughout. 



Type.—Qiii. No. 15167 U.S.N.M. 



