THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 173 



between these bristles narrow, inner side glabrous on basal half and 

 with a glabrous line inside of the inner row of bristles extending to 

 their tips. Fore tarsi (fig. 120a) about one and a third times as long 

 as their tibiae; fii'st joint yellow with a black tip, a little less than half 

 as long as the tibia; second and third joints whitish with black tips, 

 the two taken together about three-fourths as long as the first; fourth 

 black, compressed, as wide at tip as it is long, as long as third, fifth 

 joint much compressed, black, divided into two lobes which are 

 truncate at their tips, the lower lobe being the fifth joint and bearing 

 at lower apical corner the small claws and white pul villi, the upper 

 lobe arising frotn the base of the lower and a little longer, wider at 

 tip than in the middle. Middle tarsi one and a third times as long as 

 their tibiae, black from the tip of the first joint, which has a large 

 bristle above near apical third. Hind tarsi wholly black. Calypters 

 and halteres yellow, the foimer with abundant black cilia. 



Wings (fig. 120) dark grayish; costa with a small enlargement at 

 tip of first vein; last section of fourth vein bent before its middle; hind 

 margin of wing scarcely indented at lip of fifth vein; anal angle 

 prominent, the wing being of somewhat equal width. 



Female. — A female apparently belonging to this species has the 

 face wider; the hind femora without cilia, hind tibine not glabrous on 

 inner side, fore tarsi plain, longer than their tibiae, dark yellow, 

 becoming infuscated from near the base, last three joints black. Ihe 

 middle basitarsi has the conspicuous bristle at apical third that is 

 found in the male, their tibiae with three bristles below, one pair at 

 apical third and one bristle near basal third. 



Redescribed from 4 males and 1 female. Two males were taken at 

 Cathedral T.ake, Tahoe, California, July 6, by E. P. Van Duzee; 2 

 males taken in the Yosemite Valley, California, May 22, by E. T. 

 Cresson, jr. The female was taken in Emigration Canyon, Utah, 

 July 21. 



Type locality. — Cathedral I^ake, Sien*a Nevada, California, July. 



Type. — In the collection of the California Academy of Sciences. 



No. 121. DOLICHOPUS OBCORDATUS Aldrich. 



Dolichojms obcordatus Aldrich, Kansas Univ. Quart., vol. 2, 1893, p. 14, pi. 1, 

 fig. 24. 



Male. — Length 3.7-5.3 mm.; of wing 3-5 mm. Face wide, only a 

 little narrowed below, covered with coarse ocher-yellow or yellowish 

 gray pollen, often almost golden yellow. Front bronze or coppery 

 with green margins, shining. Antennae wholly black; third joint 

 rather large, longer than wide, somewhat conical in outline. Lateral 

 and inferior orbital cilia yellowish, about six of the upper cilia on 

 each side black. 



187329—21 12 



