THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 59 



Coxae, legs, and feet black, knees only a little paler. Fore coxae 

 yellow (in one specimen only slightly reddish) on inner edge, covered 

 with conspicous black hairs on anterior surface. Middle and hind 

 femora each with one preapical bristle, the latter not ciliated below. 

 Posterior tibiae a little thickened, about five large bristles in each 

 row on upper edge and a row of stiff hairs, in which are inserted 

 five bristles of increasing length, below. Fore tarsi (fig. 21a) a 

 little longer than their tibiae, the first four joints being equal to 

 the tibiae in length; first joint as long as the three succeeding joints 

 taken together, third a little shorter than the second, fourth slightly 

 compressed, half as long as third, as wide as long; fifth compressed, 

 scarcely as long as the second jomt, somewhat oval in outline but 

 widest near the tip, where it is rather truncate, but still a little 

 rounded. Middle tarsi one and a fourth times as long as their 

 tibiae, their basitarsi with a large bristle above at apical third. 

 Calypters and halteres yellow, the former with black cilia. 



Wings (fig. 21) grayish, scarcely darker in front; costa slightly 

 enlarged at tip of first vein; last section of fourth vein a little bent 

 near its basal third, the distance of this bend from the cross-vein 

 about equal to the length of that vein; third vein bent backward 

 so as to approach the fourth at tip; hind margin of wing indented 

 at tip of fifth vein and with a wide sinus between the fifth and sixth 

 veins, so as to form a slight lobe back of fifth- vein and another at 

 tip of sixth vein; anal angle of wing prominent. 



Female. — Face wider and more grayish brown than m the male; 

 antennae and palpi about as in the male; the fore coxae seem to be 

 altogether black and have the same rather long black hairs as the 

 male; fore tarsi plain, still the fifth joint very slightly widened, as 

 long as third, fourth distinctly shorter than third; middle tibiae 

 with three bristles below their basitarsi, with a large bristle above. 



Described from 3 males and 1 female, taken at Tuolumne Meadows, 

 California, Aug. 8, 1916, at an elevation of 9,000 feet, and one 

 male taken at Soda Springs, California, at 8,600 feet, by G. R. 

 Pilate. 



Type.— Male, Cat. No. 22987, U.S.N.M. 



No. 22. DOLICHOPUS STENHAMMARI Zetterstedt. 



Dolichopus stenhammari Zetterstedt, Insecta Lapp., 1839, p. 710 (annulipes, 

 preoc); Diptera Scand., vol. 2, p. 521. — Osten Sacken, Cat. N. Amer. 

 Dipt., 1878, p. 108.— Coquillett, Proc. Wash. Acad. Sci., vol. 2, 1900, p. 

 424. — Aldeich, Cat. N. Amer. Diptera, 1905, p. 305. 



Male. — Length 4.4-5 mm.; of wing 5-5.25 mm. Face wide with 

 its sides nearly parallel, silvery white. Front dark green, some- 

 what dulled with brown pollen. Antennae wholly black; third 

 joint a little longer than wide, somewhat pointed; arista a little 



