246 ERNEST A. BACK. 



polished, pitchy-black. On the mesopleurae and upper part of the 

 sternopleurae, with golden- yellow pile, modetately dense; just beyond 

 this there is smooth polished space. Halteres yellow. Abdomen red, 

 darker, somewhat ferruginous along the tergum; very highly polished 

 and clothed with sparse short golden pile. Legs wholly reddish- 

 yellow, only the tips of the claws black; pul villi and the base of the 

 veins and cells are yellow; of the male wholly black, except at the 

 very base. The first and fourth posterior cells a little more narrowed 

 at their outer parts than in melas; in one male, the fourth is closed in 

 the margin." 



Type. — University of Kansas. A single female specimen. 

 Habitat. — Kern Co., Cal. (type). March. 

 I have seen a specimen at the National Museum taken in 

 the same locality in March, v^^hich agrees with the description. 



DICOLONUS. 



Dicolonus Loew, Cent., VII, 56, July, 1866. 



Dicolonns Schiner, Verh. Zool.-Bot. Ges., XVI, 847; Oct., 1866 

 (quotes original desc). 



More or less pilose species with fine hair-like bristles hardly 

 distinguishable as such. Head small, scarcely broader than 

 the thorax, vertex but little depressed. Face moderately 

 broad, in profile showing two characteristic protuberances; 

 the facial gibbosity below or on the middle, and bearing a 

 dense mystax of fine, hair-like bristles, and the antennal 

 tubercle above clothed with forward directed hair and bearing 

 the antennae. Antennae longer than the head is high, rather 

 stout; first segment cylindrical, about twice the length of the 

 short second segment, both abundantly clothed with short 

 hair above and below; third segment sublineate and subequal 

 to the first two taken together, gradually tapering toward the 

 tip; style short, obtuse, at base equaling in width the third 

 segment; both with a microscopic pubescence. Abdomen of 

 female robust, rather broad; of the male, more cylindrical. 

 Legs moderately robust, front tibiae without terminal claw-like 

 spurs, all the tarsal segments subglobular, pulvilli normal. 

 Wings proportionately broad, all the posterior cells wide open; 

 the anal cell narrowly so. 



Type. — Dicolonus simplex Loew. 



