NEW MUSCOID FUES FROM THE ANDEAN MONTANYA |37 



and one female, July 2, two males, July 23 and 24, two males and two 

 females, all on flowers of Buddleia occidentalis. Matucauia, about 

 8,000 feet, August I , one male on foliage ; August 1 6, one mzJe and 

 one female on flowers of Baccharis sp. 



Clypeus silvery- white poUinose ; epistoma, parafacials, and cheeks light 

 golden pollinose ; parafrontals silvery-white poUinose but the black ground- 

 color showing through, unlike preceding pjirts whose ground-color is light. 

 Frontalia and first two antennal joints light yellowish-brown to paJe 

 brownish, the frontalia usually darker. Third antennal joint and arista 

 dark brown or blackish. Occiput with dark background, silvery-white 

 pollinose. Pile of occiput and cheeks pale brassy, that of parafrontals 

 black, that of parafacials black and yellow intermixed. Thorax blackish, 

 with thin silvery-white pollen, same color as parafrontals, the disk with 

 four narrow dcirk vittae of usual pattern. Scutellum light brown, faintly 

 silvered, more so basally. Abdomen deep browTi to black, subshining 

 where not covered with the heavy silver-white pollen, the latter occupy- 

 ing the irregular lateral one-third of each segment in a broad irreguleir 

 lateral vitta, the two vittae confluent posteriorly on anal segment the ante- 

 rior half of which they cover. This leaves the black confined to edges 

 of abdomen, last half of anal segment, and central area of first to third 

 segments. Venter black, faintly silvery on sides. Legs rust-yellow, the 

 coxae approaching shade of second antennal joint ; tarsi bright light yel- 

 low, tibiae approaching same shade at times ; spines of teirsi rust-yellow, 

 those of rest of legs black. Claws yellow tipped with brown. Wings 

 wholly deeply infuscate, quite black ; tegulae quite white in both scales, 

 save only the yellowish margins. Second aristal joint is conspicuously 

 elongate. Spines of abdomen and scutellum heavy. 



Type, female. Verrugas Canyon, July 24, TD4173 (fly, straplike 

 uterus). 



Trichosaundersia, new genus. 



Differs from Epalpus principally in the thick pile of abdomen inter- 

 spersed among the bristles and covering whole surface, as well as the 

 thick short pile of thorax, and the deeply emarginate anal segment of 

 female although the abdomen tapers abruptly on anal segment. The sec- 

 ond aristal joint is only moderately elongate, about twace as long as v^de. 

 The spines of abdomen and scutellum are only moderately strong at best. 

 Two or three postsutural, and two or three stemopleural bristles. Two 



