NO. 1935. MU8C0ID FLIES FROM SOUTH AMERICA— TOWNSEND. 321 



discal macrochsetse thickly placed with erect bristles on second, third, 

 and anal segments, the anal thickly hairy and bristly. Claws of 

 female elongate but hardly as long as last tarsal joint; hind tibiae sub- 

 ciliate, with one heavy bristle near middle about twice as long as cilia; 

 middle tibiae wdth an immense bristle on outer surface near middle, 

 being about one-half as long as tibia. Wings rather large, anal cell 

 widely open well before wingtip, fourth vein bent at rounded angle, no 

 wrinkle or stvimp at bend, hind cross vein nearer bend. 



Reproductive habit, larviposition on or as near host as fly can 

 approach; uterus coiled, developing white maggots. 



Type-species. — Chsetosisyrops montanus, new species. 



CH.ffi;TOSISYROPS MONTANUS, new species. 



Length of body, 10 mm. ; of wing, 9 mm. Four females, Matucana, 

 Peru, west slope of Cordillera Occidental, about 7,800 feet, April 4, 

 1910, on flowers of Cyclanthera, sp. 



Black, with head and thorax famtly silvery. Head black, occiput 

 ashy except the tergite of sixth segment, face and front thinly silvery- 

 white frosted, the facial plate brownish-yellowish in ground color in 

 middle below, palpi sanje brownish-yellow color, frontalia and anten- 

 nse dark brown. Thorax very thinly and faintly pollinose, the four 

 vittse delicate and indistinct. Scutellum brick-yellowish. Abdomen 

 soft deep brown, neither shining nor pollinose above, faintly silvery 

 on middle of venter. Legs black. Wings smoky on baso-costal por- 

 tion. Tegulse deeply smoky. 



Type.— C&t. No. 15159, U.S.N.M. TD 3929, e., m., cph. sic. 



SIPHOSTURMIA POLLINOSA, new species. 



Siphosturmia, sp. Townsend, Ann. Ent. Soc. Amer., vol. 4, 1911, p. 135. — 

 TD 4002. 



Length of body, 7 to 8 mm.; of 'vving, 5.5 to 6 mm. Numerous 

 females, Somate, valley of the Rio Chira, in the coast strip of northern 

 Peru, November 18, 1910, on flowers of Telanthera, sp. 



Head silvery-white pollinose, the front and upper part of occiput 

 with a brassy-cinereous tinge. First two joints of antermse reddish- 

 yellow, third j oint and arista black. Palpi reddish-yellow. Pleurse sil- 

 very-cinereous ; mesoscutum, scutellum, and abdomen with the same 

 brassy-cinereous pollen as front. The usual five vittse on mesoscutum ; 

 scutellum with tliree lateral pairs of marginal macrochaetse, a slender 

 decussate apical pair, and a widely separated discal pair. First ab- 

 dominal segment wholly blackish above, slightly pollinose below; 

 second and third segments with black posterior border ; posterior half 

 of anal segment reddish-yellow; no median bristles on first segment, a 

 median marginal pair on second, a lateral marginal on first and second, 

 4S702'— Proc.N.M.vol.43— 12 21 



