NO. 1935. MUSCOID FLIES FROM SOUTH AMERICA— TOWNSEND. 363 

 PIL£I70PSIS ARABELLA, new species. 



Length of body, 4.5 mm.; of wing, 3.5 mm. One male, SuUana, 

 Peru, valley of Rio Chira, April 11, 1911, on foliage. 



Shining polished black; head thinly to thickly pollinose with 

 silvery-white, showing in a densely silvery crescent on parafacials 

 and paraf rontals, the obUque inner-posterior portion of latter shining. 

 Antennae and palpi wholly black, the frontalia brownish. Thorax 

 including pleurae faintly and thinly silvery pollinose, hardly apparent 

 in some lights, in others very distinct. Two vittae are indicated on 

 mesoscutum, but indistinctly, Scutellum wholly black and shining. 

 Abdomen shining black, the very narj^ow anterior margins of second 

 and third segments silvery- white. Legs black. Wings clear; 

 tegulae watery, the front pair whitish. 



Type.— C&t. No. 15207, U.S N.M. 



SARCOMACRONYCHIA TRIVITTATA, new species. 

 Sarcomacronychia, sp. Townsend, Ann. Ent. Soc. Amer., vol. 4, 1911, p. 130. — 

 TD 3996. 



Length of body, 6.5 to 7 mm.; of wing, 4.75 to 5.5 mm. Two 

 males and two females, Piura, Peru, November 4, 1910, to March 20, 

 1911, on flowers of species of Mikania, on foliage and in house. 



Head silvery pollinose, the parafrontals m both sexes faintly golden. 

 Front narrow m both sexes, at vertex about one-sixth of head-width, 

 conspicuousl}^ narrowed on anterior half in female but hardly at all 

 so in male. Occiput ashy. Palpi and antennae black. Body silvery- 

 cinereous pollinose, three heavy black vittae running uninterruptedly 

 the full length of mesoscutum anci scutellum and continued on abdo- 

 men a little less definitely to hind border of third segment. The anal 

 segment is wholly rust-golden in both sexes, the other segments sil- 

 very pollinose save for the vittae and narrow blackish hind margins. 

 Two sternopleural and three postsutural bristles. Scutellum with two 

 lateral strong pairs of bristles and a decussate apical pair nearly as 

 strong; discal pair hairlike. Abdomen in both sexes with a median 

 marginal pair of macrochaetae on second segment and a marginal row 

 on third and fourth segments. Legs black, femora faintly polUnose 

 on outer surface, front ones thickly so; claws and pulvilh of male 

 quite strongly elongate, those of female short. Wings clear, tegulae 

 whitish. 



Type.— Cfit. No. 15208, U.S.N.M. Female, November 12, 1910; 

 TD 3996. 



Deposits maggots from a double-sac uterus. 



