NO. 2115. NEW NEOTROPICAL MUSCOID FLIES— TOWNSEND. 437 



abdominal segments, and may represent a distinct species. Brauer 

 and Bergenstamm state that the macrochaetae are only marginal, 

 and they had both sexes. The present female has the black hind 

 borders of segments very narrow, conspicuously narrower than in 

 the above males. Eyes are not quite so thickly hairy; hind tibiae 

 weakly ciliate, with a longer bristle; third antennal joint about three 

 times second, cheeks hardly one-half eye-height. Vertex a Httle less 

 then one-third head-width. Otherwise as in the males. 



It is evident that there are many very distinct Neotropical forms 

 of the higher muscoid groups whose upper parts are more or less 

 vividly gold-green in hfe. Chrysoexorista and a new genus are South 

 American ; Bolomyia ranges from Brazil to Mexico ; Paramesochaeta 

 is Mexican ; while another new genus ranges from Mexico to the high 

 boreal of northern New Mexico in the Las Vegas Range. Macromei- 

 genia represents this coloration type in eastern North America. 



MICROPLAGIA, ne^?v genus. 



Genotype. — Microplagia nitens, new species. 



Venation Fona-Uke. Apical cell very short-petiolate, the petiole 

 barely distinguishable. Hind crossvein in middle between small cross- 

 vein and cubitus. Costal spine present. Head subhemispherical in 

 profile ; the front long, very flattened. Eyes bare. No ocellar bristles. 

 Antennae short, inserted about on eye-middle, second and third 

 joints about equal. Face short, widening from front. Parafacials 

 with row of f acio-orbitai bristles, the lower ones most pronounced, the 

 the upper ones very delicate. Arista thickened on basal fourth, with 

 short hairs in middle. Three proclinate orbital bristles in female. 

 Proboscis short ; palpi elongate, subfiliform, hardly thickened apically. 

 Parafacials nearly as wide as facial plate, of even width. Faciaha 

 bare. Frontal bristles descending only to base of second antennal 

 joint. Lunula conspicuous, horseshoe-shaped. Vibrissae on oral 

 margin. Cheeks scarcely over one-fourth eye-height in female . Front 

 of female at vertex about five-sixths eye-width. Scutellum without 

 apical pair of bristles, with only two long lateral pairs. Abdomen 

 short-oval ; macrochaetae very short, subhairhke, no discal, no median 

 except pair on third and fourth segments. All segments with a lateral 

 marginal bristle or two. Two sternopleurals, and three postsuturals. 

 Legs short, front tarsi of female noticeably thickened. Wings short. 



MICROPLAGIA NITENS, new species. 



Length of body, 4 mm.; of wing, 3 mm. One female, valley in 

 foothills a league north of Lima, Peru, on herbage, December 5, 1912 

 (Townsend) . 



Black; abdomen, pleurae, head, and legs mostly shining. Parafa- 

 cials and parafrontals very thinly cinereous polhnose, facial plate 

 faintly so. Mesoscutum and scutellum thinly ashy-silvery; former 



