306 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 43. 



to oral margin iu both sexes; arista A'ery long and tliickened only on 

 extreme base, basal joints short. Inner vertical bristles of ordinary 

 strength, about hke frontals or orbitals. Proboscis short and flesh}^, 

 palpi elongate and somewhat thickened apicall}". 



Three strong sternopleural bristles, three postsutural. Two strong 

 lateral scutellar pairs, the posterior twice as long as anterior; a strong 

 long decussate apical pair; a very weak discal pair. Scutellum with 

 erect short bristly hairs. Abdomen very elongate and narrow, espe- 

 cially narrowed posteriorly in female. A strong median marginal 

 pair of macrochsetfe on first and second segments, six or eight strong 

 marginal in row on third, a discal and marginal row of weak ones on 

 anal segment in female, but strong in male. Legs long, hind tibiae 

 with irregular bristles and neither ciliate nor pectinate, but subciliate, 

 with very short bristles among the long ones. Claws of female mod- 

 erately strong, those of male a very little stronger. Tibiag and femora 

 in general very bristly. Wings long, apical cell %ndely open just a 

 little before tip of wing, fourth vein rounded at bend and without 

 stump or wrinkle, hind cross vein nearer bend of fourth. 



Reproductive habit, host-oviposition; uterus presumably present; 

 eggs flat-oval, macrot3*pe. 



Type-species. — Euthelaira inamhanca, new species. 



This genus seems to approach Ptilodegeeria, running there in 

 Brauer and Bergenstanmi's tables. It differs in ha^Tug third vein 

 bristly only at base, facialia ciUate on more than lower one-third, and 

 in the sexual character of the ocellar bristles. 



EUTHELAIRA INAMBARICA, new species. 



Length of body, 10 to 10.5 mm. : of wing, 8 to 9 mm. Three females 

 and two males, Rio Inambari at junction of its affluent, the Rio 

 Yahuarmayo, foot of eastern slope of Cordillera Oriental in the mon- 

 tana of southern Peru, about 1,700 feet, February 8 to 11, 1910, on 

 foliage. 



Face, cheeks, front, and orbits pure silvery-white, with an almost 

 snow-white shimmer; parafrontals usually faintly golden in middle 

 and posteriori}^ in female, less so or not at all in male. Occiput 

 cinereous, usually with a brassy tinge, the tergite of sixth segment 

 blackish. Beard gray, not profuse. Frontalia and antennae black 

 or dark brown. Palpi brownish-yellow. Pleurae silver3\ Mesoscu- 

 tum and scutellum silvery with a distinct golden tinge, the usual 

 four vittse fairh' distinct. Second and third abdominal segments 

 sflvery-white pollinose on basal one-half above and below, the pollen 

 sometimes with a faint suggestion of brassy, the rest of abdomen shin- 

 ing dark bro^^Ti. Legs blackish, front femora sflvery on outside. 

 Wings smoky on costal border and long veins. Tegulss nearly white, 



