AMERICAN DIPTERA. 303 



whitish. Legs black, covered with dense, fine, whitish pile, longer on 

 the under side of the femora and interspersed with a few light colored 

 bristles. Coxae and legs with brownish-gray bloom, thicker on the 

 coxae; coxae with long white pile. Wings hyaline; anal cell closed 

 and petiolate; fourth posterior cell slightly narrowed at the margin 

 of the wing; anterior cross-vein at the middle of the discal cell." 



Type. — One female type and two female paratypes, in the 

 collection of the University of Nebraska. 



Habitat. — Halsey (type, June 1, 1906, H. S. Smith), and 

 War Bonnet Cafion (May 27) and Bad Lands, Mouth of Monroe 

 Canon (May 28), Sioux Co., Nebr. 



" This species can be readily distinguished from L. arenicola 

 Osten Sacken, in being more densely pruinose and not so 

 densely pilose as that species. The thoracic stripes will also 

 serve to separate them, and my specimens of L. arenicola 

 from Southern California have a few black bristles in the 

 lateral margins of the thorax which quadrivittatus does not 

 have." 



I do not know this species. 



METAPOGON. 



Metapogon Coquillett, Proc. Ent. Soc. Wash., VI, 181, 1904. 

 " Near Cyrtopogon, but the face is nearly flat, only slightly 

 swollen on the lower part; the mystax very sparse except 

 along the oral margin and composed chiefly of bristles, etc. 

 head unusually broad, over twice as broad as high, deeply 

 excavated on the vertex, ocelli tubercle very prominent, front 

 only slightly widening upwardly, at its lower end about three- 

 fifths as wide as either eye, face slightly widening below, sub- 

 equal in width to the front, eyes unusually prominent (nearly 

 as in Holcocphala abdominalis) ; antennas less than twice as 

 long as length of head, the first segment subequal in length to 

 the second, the latter as wide as long, each bearing a stout 

 bristle on the under side, third segment nearly twice as long 

 as first two together, slightly widening outwardly, about five 

 times as long as its greatest width, style less than half as wide 

 as the third joint and at most one-third as long; proboscis 

 straight, tapering to the tip. Mesonotum greatly swollen, 

 provided with strong bristles. Abdomen cylindrical. Fe- 



TRANS. AM. ENT. SOC, XXXV. AUGUST, 1909 



