THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 109 



yellow tips; middle ones black at base, gradually becoming yellow, 

 the apical half being mostly yellowish; hind femora black on upper 

 half, more yellowish on lower half. Middle and hind femora each 

 with one preapical bristle, the latter not ciliate below. Tibiae 

 yellow; middle ones slightly darkened at tip, with one long slender 

 bristle below; posterior pair a little thickened at tip, black apically 

 for one fourth their length, which is rather sharply defined. Fore 

 tarsi black fron the tip of the first joint, one and a fourth times as 

 long as their tibiae, first joint about as long as the three following 

 joints taken together, fourth joint shorter than fifth. Middle tarsi 

 black from the middle of the fu'st joint, about one and a fourth times 

 as long as their tibiae, their basitarsi without a bristle above. Hind 

 tarsi wholly black. Calypters and halteres yellow, the cilia of the 

 former black. 



Wings (fig. 65) grayish; costa not enlarged at tip of first vein; last 

 section of fourth vein a little bent just before its middle; hind margin 

 of wing not indented at tip of fifth vein; evenly rounded; the anal 

 angle not prominent. 



Described from 1 male from Mount Washington, New Hampshire, 

 on August 16, 1916, taken by C. W. Johnson, at an elevation of 

 5,000 feet. 



Type. — In the collection of the Boston Society of Natural History. 



No. 66. DOLICHOPUS VARIPES Coquillett. 



DoKchopus varipes Coquillett, Proc. Wash. Acad. Sci., vol. 2, 1900, p. 425. — 

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



Afale. — Length, 4 mm.; of wing, the same. Face rather narrow; 

 palpi and face covered with dense, yellowish pollen. Front shining 

 green. Antennae black with the first two joints yellow on lower edge ; 

 third joint only a little longer than wide, obtuse at tip, orbital cilia 

 black and strong above, pale and short on lateral orbit, a few of the 

 lower ones long and yellow. 



Thorax green, dorsum somewhat dulled with gray pollen, which 

 leaves the posterior part and a central vitta shining; pleurae more 

 blackish, dulled with gray pollen. Abdomen dark green. Hypo- 

 pygium black; its lamellae of moderate size, somewhat ovate, whitish 

 with a black border, jagged and bristly on apical margin, fringed 

 above with black hairs. 



Fore coxae wholly yellow with silvery white pollen, front surface 

 with little black hairs, except on the upper outer part where the hairs 

 are very minute and white. Middle and hind coxae black, their tips 

 and the trochanters yellow. Fore and middle femora yellow, the 

 latter with a black or brown streak below. Hind femora black with 

 their extreme tips yellow. Middle and hind femora each with one 

 187329—21 8 



