258 NORTH AMERICAN FAUNA. [No. 7. 



ing; hypopygium small, mostly concealed. Legs black, grayish or greenish prui- 

 nose; front metatarsi in the male thickened and Longer thau the following three .joints 

 together; in the female, simple but elongate. Wings grayish, hyaline; small cross 

 vein opposite the tip of the first longitudinal vein; posterior cross vein oblique. 

 Length, 5-6""". 



Two specimens, Owens Valley, May 21, 1891. 



This species will be readily recognized by the small hypopygium of the male, 

 and the thickened front metatarsus in the same sex, together with the nearly bare 

 arista. 



Notiphila decoris n. sp. 



Female. — Front gray or brownish gray, with two black stripes, separated by the 

 triangular, brownish ocellar triangle ; the median, anteriorly directed pair of bristles 

 well developed. Antenme and palpi black. Face opaque, light golden yellow. 

 Dorsum of thorax and scutellum opaque yellowish brown, somewhat grayish an- 

 teriorly; the stripes only feebly indicated. Pleura more grayish-yellow below, 

 with two shining black spots. Abdomen chiefly dark coft'ee-brown, with the poste- 

 rior part and a median stripe on each segment gray. Legs black, the base of the 

 front metatarsi and the first three joints of the four posterior tarsi reddish yellow. 

 Wings cinereous. Length, 3£ mm . 



One specimen, Panamint Valley, Calif, April. 



Pelomyia gen. nov. Ejphydridarum. 



Third joint of antenna? rounded, second joint not unguiculated; arista long, very 

 finely pubescent, nearly bare. Eyes wholly bare. Face of only moderate breadth, 

 moderately convex. Cheeks moderately broad. Front moderately broad with well- 

 developed bristles." Clypeus not projecting. Thorax with four rows of bristles, ex- 

 tending to the anterior part. Middle tibia? without bristles on the outer side. 



The genus seems nearest related to Pelina, from which it differs in the retracted 

 clypeus, the bristles of the anterior part of the thorax, etc. The eyes are bare 

 under the highest magnification. The neuration does not differ from Notiphila, *etc. 



Pelomyia occidentalis n. sp. 



Male, female. — Vertical triangle large, yellowish gray; front, below the triangle, 

 opaque yellow, the orbital margins narrowly white, pollinose; vertical triangle, 

 with two proclinate bristles; a row of three bristles on the orbital margin. Anten- 

 nae brownish black, the under side of the third joint yellowish; second joint with a 

 weak bristle at its extremity. Face yellow, not broad, somewhat whitish, pollinose ; 

 on either side with a few short, weak bristles. Dorsum of thorax brownish gray, 

 with three slender brown stripes. Scutellum large, bare, with two pairs of bristles, 

 the intermediate pairnearthe apex and large, the outer pair small. Abdomen black, 

 with a brownish pubescence, opaque, the small hypopygium shining black; in 

 shape elongate oval ; sixth and seventh segments of the female very short. Legs 

 black, or somewhat luteous, rather slender ; femora with some short bristles. Wings 

 nearly hyaline. Length, 2^ mm . Two specimens, Monterey, Calif. 



Scarcely any attention has hitherto been given to the Borboridre of 

 America, a group of considerable interest, as including several of the 

 few wingless forms of Diptera. I have examined about twenty species 

 of the family from the United States and West Indies, nearly all of 

 which are yet undescribed. I give here a table of genera based upon 

 these species, and will shortly publish descriptions of them : 



North American genera of Borboridos: 



1. Wingless species Apterina 



Wings fully developed 2 



