214 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



tliau fiist, not quite as wide as long, somewhat round in outline 

 fringed above with little black hairs. Middle tarsi one and a fourth 

 times as long as their tibiae, black from the tip of the first joint, 

 which has a large bristle above. Hind tarsi wholly black. Calypters 

 and haltcros yellow. 



Wings (fig. 153) graj'ish; costa not enlarged at tip of first vein; last 

 section of fourth vein moderately bent near its middle; hind margin 

 of wing a little indented at tip of fifth vein; slightly widened at tip of 

 sixth vein so as to form a slight lobe; anal angle prominent; wing of 

 rather equal width. 



Female. — Face grayish, wide; fore tarsi plain, a little longer than 

 their tibiae, infuscated from the tip of the first joint, first joint about 

 as long as the three following joints taken together, middle tarsi about 

 as in the male, their basitarsi have the bristle at apical third; hind 

 basitarsi yellowish on basal third or more; wings with the hind margin 

 nearly evenly rounded; anal angle rounded. 



Described from many males and females. J. M. Aldrich took it at 

 Viola, Idaho, Jmie 26; Moscow, Idaho, June 14-August 23; Juliaetta, 

 Idaho, May 12; and Grangeville, Idaho, June 27. Baker took it in 

 Colorado. A. L. Melander took it at Bovill, Idaho, June 17 ; Potlatch, 

 Idaho, June 27; Troy, Idaho, June 14; Pullman, Washington, June 

 6-July 11; Palouse, Washington; Union Flat, Washington, June 6; 

 Three Forks, Montana, August 1; Helena, Montana, August 6; Yel- 

 lowstone Park, Canyon Camp, August 12. W. M. Mann took it at 

 Nigger Hill, Powell County, Montana, in July. 



Ti/pf .— Male, Cat. No. 23044, U.S.N.M. from Moscow, Idaho. 



No. 154. DOLICHOPUS COLOKADENSIS Aldrich. 



Dolichopus agilis Aldrich, Kansas Univ. Quart., vol. 2, p. 16, pi. 1, fig. 19; name 

 changed on page 26. 



The following is a copy of Aldrich's original description: 



Antennae ]>lack, first joint yellow; cilia of inferior orbit pale, of tegulae black; legs 

 yellow, hind tarsi wholly black. 



Male. — -Face yellowish gray; front shining green. Dorsum of thorax shining green; 

 pleurae blackish, with gray dust. Abdomen shining green; hypopygium black, at 

 base somewhat green or bronze. Lamellae light yellow, twice as long as wide, the 

 black border wide at tip, which is a little jagged and has two or three crooked black 

 bristles; upper margin smooth with short black hairs changing to yellow toward the 

 base. Fore coxae yellow with minute black hairs in front; middle and liind coxae 

 black, tipped with yellow. Femora and tibiae yellow, plain. Front tarsi [fig. 154] 

 almost once and a half as long as the tibiae, first three joints slender, stalk like, yellow, 

 second and third each more than half as long as the preceding; fourth very short, wider 

 than long; fifth joint as long as the second, ^\•ide, black, Avith fringe of appressed black 

 hairs above. Empodium a little enlarged, forming a snow-white plume reaching up 

 half the width of the fifth joint, so the latter appears to have a white tip. Middle tarsi 

 gently infusfatod from the tip of the first joint. Wings with a grayish tint, the fourth 

 vein running rather far forward toward its tip ; costa not thickened. 



Length 5 mm.; of wing 4.5 mm.; one male and two females. Colorado (U. K.) 



