62 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



Described from 2 males and 1 female, taken on Mount Rainier in 

 Paradise Valley, Washington, at an elevation of 8,000 teet, Aug. 6 i>, 



1919 by C. L. Fox. „ 



The hairs of tlie coxae and legs although black appear to be yellow 

 or white when viewed in certain lights, the bristles of hind tibiae 

 may appear whitish at tip or black at base and tip while the center 



is white. . , i? o • 



Type and allotype in the California Academy of Sciences. 



No. 24. DOLICHOPUS ACUMINATUS Loew. 



Dolidu,pus acnmiruuus LoBW, Neue Beitr., vol. 8, 1861, p. |2. """-"'/^j ''^^■ 



Dipt., pt. 2, 1864, p. 34.-Me;landeb and Brues, Biol. Bull., vol. 1, 190U, 



p. 148.— Johnson, Insects of N. J., 1909, p. 756. 



Male.-^hmgth 3-4 mm.; of wing 3 mm. Face narrow, sUyery. 



Front dark sllning green. Antennae (fig. 24a) wholly black; h^d 



mint only a little longer than wide, somewhat ova but with a little 



point at tip; lower orbital cilia white, the black ciha descend about 



one-third the eye height. , 



Thorax dark shining green; pleui-ae a httle duUed with white 

 poUen. Abdomen dark shining green with black incisures and a 

 little white pollen on the lower edges of sides Hypopygmm black 

 its lameUae (fig. 24) large, nearly as long as the hypopyg-""^. ''bout 

 three times as long as wide, acutely pomted at tip, -^.te with a black 

 border which is naiTow on the upper and lower edges but becomes 

 wider toward the tip, fringed with dark hairs on the edges 



Coxae, legs, and feet black, knees, extreme base «* '°>-ej^"^ midd e 

 tarsi and fore tibiae more or less, sometimes mostly yeUowish. Fore 

 coxae with very minute black hairs. Middle and hind femora each 

 with ol preapLl bristle, the latter without cilia below. Posterior 

 tibiae only slightly thickened; the glabrous stripe on the upper 

 urface can be'seen as a narrow shining line between the rows o 

 bristles. Fore tarsi scarcely as long as their tibiae, the first joint 

 about equal in length to the remaining four taken together. Middle 

 and hind tarsi only a little longer than their tibiae. Calypters and 

 halteres vellow, the former with black cilia. . , , ,• 



wTngs^grayish; costa not thickened at tip of first vem; last sec tion 

 •of fourth vin a little bent before its middle; hind margm not or 

 scarcely indented at tip of fifth vein, evenly rounded, the anal angle 

 not being much developed. ^i^- a ^,^a 



Fe^i.-Face wider than in the male, -'^-^ "'f' ^i!' Mid^e 

 fourth veins seem a little less convergent than in the '"''!«• J«'ddle 

 tibiae with- one bristle below; their has tars, without - br.^^^ f oj- 

 Redescribed from many males and femal^ taken at. Algonquin^ 

 Illinois July 9; Battle Creek, Michigan (Aldrich); Socorro, New 

 Mexico (Wiaist;n); Ithaca, New York, July; western New York, 

 May- August. 



