NO. 1935. MUSC'OID FLIES FROM SOUTH AMERICA— TOWWSEXn. 341 



terior pair especially long and nearly reaching base of third abdomi- 

 nal segment; a weak decussate apical pair, and a weak discal pair. 

 A weak median marginal pair of macrochaetaB on first abdominal seg- 

 ment, a strong median marginal pair on second, a marginal row on 

 third and fourth. Hind tibiae thinly pectinate, the bristles not flat- 

 tened or cilia-like, with a longer bristle near the middle. Claws of 

 female fairly long, about equal to last tarsal joint. Venation typical, 

 the apical cell open and ending well before wingtip, the hind crossvein 

 nearer bend of fourth, no wrinkle or stump at bend of latter. 



Reproductive habit, leaf-oviposition ; uterus shortened and thick- 

 ened, with black microtype eggs. 



Type-species. — Brachymasicera polita Townsend. 



BRACHYMASICERA POLITA Townsend. 



Brachymasicera polita Townsend, Ann. Ent. See. Amer., vol. 4, 1911, pp. 133, 

 143.— TD 3987. 



Length of body, 8 mm. ; of wing, 6 mm. One female, Piura, Peru, 

 November 7, 1910, on flowers of species of MiJcania. 



Front, face, cheeks, orbits, and ocellar area deeply golden pollinose, 

 the facial plate a little less distinctly so. Frontalia brown. Antennae 

 brown, first two joints and palpi reddish-yellow. Occiput densely 

 ashy pollinose, the tergite of sixth segment conspicuously soft dark 

 brown. Occipital pile gray, not very thick. Thorax, scutellum, and 

 abdomen with pollen of a faint golden shade, most distinctly golden 

 on sides of last three and especially last two segments of abdomen, 

 nearly silvery on pleurae, venter of first abdominal segment except 

 narrow hind margin silvery-cinereous. Four vittae on mesoscutum, 

 the outer ones interrupted at siiture. First abdominal segment above 

 blackish, hind borders of second and third segments blackish in some 

 fights. Legs dark brown. Wings clear, tegulae whitish. 



Type.— Cut. No. 15180, U.S.N.M. TD 3987, e., ch., m. 



BRACHYMASICERA SUBPOLITA, new species. 



Length of body, 7.5 mm.; of wing, 5.5 mm. One female, Piura, 

 Peru, Jiuie 19, 1910, on foliage. 



Differs from preceding species as follows: All of head except 

 occiput silvery-white pollinose, only faint shade of brassy at vertex. 

 Occiput ashy pollmose, with a brassy tinge, tergite of sixth segment 

 dark brown. Palpi and first two antennal joints paler yellowdsh. 

 PoUen of venter of first abdonunal segment more nearly concolorous 

 with rest, having a faint tmge of golden. Legs wholly yellowish-red 

 to reddish-yellow, tarsi dusky. 



Type.— Cat. No. 15181, U.S.N.M. TD 3907, e., cph. sh. 



