THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 43 



tarsi scarcely as long as their tibiae; second to fifth joints of about 

 equal length and taken together a little longer than the first joint. 

 Middle tarsi a little longer than their tibiae, their basitarsus without a 

 bristle. Calyptei-s yellow, their cilia black. Knobs of hal teres yellow, 

 their stems brown. 



Wings (fig. 5) grayish; costa not thickened at tip of first vein; 

 last section of fourth vein a little bent beyond its basal third; hind 

 margin of wing scarcely indented at tip of fifth vein; wings narrowed 

 toward their bases, with the anal angle scarcely at all developed, 

 leaving the sixth vein close to the wing margin. 



Described from 2 males taken at Three Rivers, California, received 

 by J. M. Aldrich from C. F. Baker. 



Type.— Msile, Cat. No. 22980, U.S.N.M. 



No. 6. DOLICHOPUS SQUAMOSUS, new species. v 



Male. — Length 3.5 mm.; of wing 3 mm. Face rather wide, 

 reaching the lower corner of the eye, rounded below, its sides nearly 

 parallel, silvery white. Front dark shining green, the silvery pollen 

 of the face extending above the antennae along the inner orbits more 

 than half way to the vertex, sometimes covering nearly the whole 

 lower half of the front. Antennae wholly black; first joint rather 

 long; third scarcely longer than wide, rounded at tip, oval in outline. 

 The black orbital cilia descending to about the middle of the eye, 

 the lower cilia being silvery white, flattened, scale-like. 



Thorax dark shining green; pleurae scarcely dulled, still with a 

 little almost invisible brownish gray pollen. Abdomen dark shining 

 green, usually with coppery reflections on the apical portion; one 

 specimen has blue reflections on the sides at base; I can not see any 

 pollen on the abdomen. Hypopygium black; its lamellae rather 

 large, somewhat triangular in outline, but broadly rounded on upper 

 angle at apex, yeUowish white with a black border, which is narrow 

 on apical portion and wider on the rounded upper edge, jagged 

 and bristly at apex, closely fringed above, sparsely below, with delicate 

 hairs. 



Coxae, legs and feet black; femora with slight green reflections; 

 extreme tips of coxae and knees yellowish brown. Fore coxae with 

 white pollen and very minute white hairs on anterior surface. Middle 

 and hind femora each with one preapical bristle, the latter bare below, 

 above with rather long hair. Hind tibiae very little stouter than the 

 anterior pairs, without a glabrous stripe above. Fore tarsi plain, 

 rather stout, scarcely longer than their tibiae; first joint as long as 

 the three succeeding joints taken together; third and fifth joints of 

 nearly equal length, fourth a little shorter, second only about one 

 third as long as first. Middle tarsi (fig. 6a) one and a fourth times as 

 long as their tibiae, a little compressed and widened, being widest 



