266 BULLETIlSr 116, UKITED STATES NATIONAL, MUSEUM. 



by a single row of hairs and extending two-thirds their length; the 

 bristles on their lower surface nearly as large as those above. Fore 

 tarsi (fig. 194) about one and three-fourths times as long as their 

 tibiae, the first two joints taken together fully as long as the tibia; 

 second joint about three-fifths as long as first, third three-fourths as 

 long as second, fourth half as long as third, and fifth longer than 

 fourth; fourth joint a little compressed, white, widest at tip; three 

 first joints normal, yellow; fifth black, much compressed, somewhat 

 oval, still a little truncate at tip, about three-fourths as wide as long; 

 fourth and fifth joints fringed above with minute black hairs. Middle 

 tarsi one and a third times as long as their tibiae, yellow, becoming 

 darker from the tip of the first joint, nearly black at tip. Hind tarsi 

 nearly as long as the middle ones and of the same color. Calypters 

 and halteres yellow, the former with black cilia, still there are a few 

 small yellow hairs among them and some longer ones below the black 

 cilia. 



Wings grayish; veins yellowish; costa with a small elongated en- 

 largement at tip of first vein; last section of fourth vein bent near 

 basal third; third and fourth veins nearly parallel and widely sepa- 

 rated; hind margin of wing scarcely indented at tip of fifth vein; 

 anal angle rather prominent but rounded; root of wing yellow. 



Redescribed from the single male type in the United States Na- 

 tional Museum, taken at Roxborough, Pennsylvania, June 7, 1908; 

 1 male taken at Dead Run, Virginia, June 23, and 1 male taken at 

 Niagara Falls, Ontario, August 4. 



Type.—M.Q\e, Cat. No. 12767, U.S.N.M. 



No. 195. DOLICHOPUS OCCIDENTALIS Aldrich. 



Dolichopus ocddentalis Aldrich, Kansas Univ. Quart., vol. 2, 1893, p. 19, pi. 1, 

 fig. 18. — ^Melander and Brues, Biol. Bull., vol. 1, 1900, p. 148. 



Male. — Length 4.5-5.5 mm. ; of wing 4.2-5 mm. Face pale yellow 

 to ocher yellow, rather vnde, narrowed below. Front shining green 

 with a little yellowish pollen along the orbits. First antemial joint 

 yellow, sometimes narrowly black above, second joint black, some- 

 times a very little yellowish below; third black, about as long as 

 wide, rather rounded at tip. Lateral and inferior orbital cilia yellow, 

 about seven of the upper cilia on each side black. 



Thorax green with coppery reflections, which often form a narrow 

 line on each side of the acrostichal bristles, sometimes there are also 

 blue reflections on the dorsum, which is dulled with gray pollen 

 along the front and yellowish on the disk ; pleurae dulled with whitish 

 pollen. Abdomen green with coppery reflections; the W'hite pollen 

 on its sides not conspicuous; the bristles on the hind margins of the 

 segments long, especially those on fifth segment. Hypopygium 

 black with metallic reflections on basal portion; its lamellae large. 



