116 PROCEEDINGS OF THE NA TIONA L MUSE UM. 



MUSCOPTERYX OBSCURA, new species. 



Differs from the male of tibialis- as follows: Tibia?, cheeks, and face 

 black; vertex one-fourth as wide as either e3^e, bristh^ hairs on sides 

 of face very short, mesonotum somewhat polished, not pruinose; 

 abdomen thinly brownish pruinose, without reflecting darker spots; 

 third vein bearing about four bristles near the base, bend of fourth 

 rounded, without a stump, the vein almost straight beA^ond the bend; 

 calypteres vellow; length. 7 mm. Two males collected July 80 and 

 August 24, 1897, by Prof. Trevor Kincaid. 



Ilahitat.—St. Paul Island, Alaska. 



Tt/j)e.— Cut. No. 6221, C.S.N.M. 



PHORICHiETA CINEROSA, new species. 



Black, the third antcnnal joint at base yellow, palpi at apex vellow, 

 changing to brown at the base; sides of front, face and cheeks opaque, 

 grayish pruinose, antenm^ three-fourths as long as the face, the third 

 joint l)lunt pointed at the apex, three times as long as the second; 

 thorax and scutellum somewhat polished, rather thinly gray pruinose; 

 abdomen highly polished, the second and third segments ])earing discal 

 and marginal l)ristles; wings hyaline, third vein bristly nearly to apex 

 of discal cell; length, 1 mm. One specimen collected July 5 b}" Mr. 

 H. S. Barber. 



Habitat. — Flagstaff', Arizona. 



Tyjje.— Cat. No. 6225, U.S.N.M. 



BRACHYCOMA PUBICORNIS, new species. 



Black, including the palpi; vertex nearly half as wide as either eye, 

 frontal bristles in a single row each side, descending slighth" below 

 base of second antennal joint, sides of face bearing a row of rather 

 long bristles on the lower half, on the upper half with one or two 

 irregular rows of very short bristly hairs, antennae three-fourths as 

 long as the face, the third joint nearly twice as long as the second, 

 arista brown, the middle yellowish, distinctly pubescent, the longest 

 slightly longer than greatest diameter of arista, the latter thickened 

 almost to the middle, vibrissas slightly" above front edge of oral mar- 

 gin, ridges bristly on lowest third, proboscis rather short and robust; 

 thorax grayish pruinose and with three black vittre, scutellum bearing- 

 three pairs of marginal bristles, the last one cruciate and but slightly 

 shorter than the others; abdomen grayish pruinose and with darker 

 reflecting spots, rirst two segments without dorsal bristles, the last 

 two Avith marginal ones, .second segment of hypopygium polished; 

 hind tibite not ciliate; wings hyaline, brownish at base and along most 

 of the veins, third vein bristly nearly halfway to small crossvein. bend 

 of fourth rectangular and with a short stump, costal spine minute; 



