68 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



Female.- — Face nearly as wide as the front, silvery white; front with 

 white pollen which nearly conceals the ground color; antennae with 

 the third joint about as long as wide. Thorax and abdomen about as 

 in the male; fore tarsi shorter than their tibiae, black from the tip 

 of the first joint; middle tarsi scarcely longer than their tibiae, black 

 from the tip of first joint, first joint without a bristle above; middle 

 tibiae with one bristle below; hind tibiae and tarsi as in the male, 

 except that the tibiae are more yellow at base. Cilia of calypters 

 black. Wi^^gs as in the male, except that the anal angle is a little 

 more prominent. 



Kedescribed from the type specimen in the American Museum, 

 which was taken at New Bedford, Massachusetts, June 8; 1 male and 2 

 females taken in the same location as the type by Hough, May 13 and 

 31, 1896 (coll. of J. M. Aldrich) ; and 2 males taken by C. W. Johnson 

 at Woods Hole, Massachusetts, June 19. 



No. 29. DOLICHOPUS GRATUS Loew. 



Dolichopus gratus Loew, Neue Beitr, vol. 8, 1861, p. 16; Mon. N. Amer. Diptera, 

 pt. 2, 1864, p. 29. — Aldrich, Kansas Univ. Quart., vol. 2, 1893, p. 7. — 

 Melander and Brues, Biol. Bull., vol. 1, 1900, p. 148. — Johnson, Insects 

 of New .Jersey, 1909, p. 756. 



Mole.- — -Length 4-4.5 mm.; of wing 4-5 mm. Face narrow, sordid 

 white, darker on upper part, sometimes tinged with yellow. Front 

 green, usually with blue reflections. Antenna (fig. 29a) wholly 

 black; third joint about as long as wide, a little pointed at tip. Palpi 

 black. Orbital cilia wholly black. 



Thorax dark green, shining, with blue and sometimes bronze 

 reflections; pleurke dulled with a little whitish pollen. Abdomen 

 green with beautiful blue reflections and black incisures; the white 

 pollen on its sides conspicuous. Hypopygium black; its lamellae 

 rather large, whitish with black border, rather truncate at apex, 

 deeply jagged and bristly on apical margin, fringed on the sides with 

 black hairs. 



Coxae black, their tips a little yellowish; fore coxae with white 

 pollen and rather long black hair on their anterior surface and strong 

 black bristles at tip. Middle and hind femora each with one preapical 

 bristle, the latter ciliated with strong black hairs on lower inner 

 edge, the longest of which are fully as long as the width of the femora. 

 Middle femora with a fringe of delicate pale hairs on their lower 

 edge, the longest of which are not half as long as the width of femora, 

 these hairs appear blackish in certain lights and end near the tip 

 with several little black bristles; the fore femora also have a fringe of 

 delicate little pale hairs on lower edge, but they are not as long as 

 those on the middle pair, these also end in several little black bristles. 

 Fore and middle tibiae yellow, with strong bristles. Hind tibiae 



