90 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



Female. — -Face as wide as the front; cilia of lower orbit less 

 flattened than in the male but silvery white; hind basitarsi with 

 only the usual number of bristles; hind tibiae more yellow than in 

 the male and the wings more grayish and without a spot at tip ; other- 

 wise about as in the male; middle tibiae with one large bristle 

 below, their basitarsi without a bristle above. 



Redescribed from numerous males and females. In the Aldrich 

 collection are specimens from Battle Creek, Michigan; Lake Mills, 

 Wisconsin, Aug., 1893; Ithaca, New York, July, 1901; Waubamic, 

 Parry Sound, Ontario, June 10. 1 have taken it in Erie County, 

 New York, from July 2 to Aug. 16; at Niagara Falls, New York, 

 June 9, and at Niagara Falls, Ontario, Sept. 28. 



Ttjpe localities. — District of Columbia and Trenton FaUs, New 

 York. Osten Sacken reports it from Newport, Rhode Island. 

 Johnson, Insects of New Jersey, 1909, from several places, taken 

 from May 16 to September 9. 



No. 49. DOLICHOPUS RETINENS, new species. 



Male. — Length 5-5.5 mm.; of wing 4.5-4.75 mm. Face rather 

 narrow, white, tinged with yeUow, more strongly so on upper portion. 

 Front dark shining green. Antennae wholly black; third joint 

 somewhat conical in outline, a little longer than wide, pointed at tip. 

 Orbital cilia wholly black. 



Thorax dark shining green, sometimes with brassy reflections on 

 the dorsum; pleurae a little duUed with white pollen. Abdomen 

 shining green with black incisures and bronze reflections, which are 

 mostly on the hind margins of the segments, the white poUen on its 

 sides forms large spots on the lower edges of the segments. Hypo- 

 pygium black; its lamellae rather large, somewhat elliptical, but 

 irregular in outline, about two-thirds as wide as long, white with 

 narrow black border on apical, upper and lower margins; jagged and 

 bristly at apex, especially on lower corner, otherwise fringed with 

 black hairs. 



Coxae black with the tips a little yellowish; anterior pair with 

 silvery poUen and very delicate, but not very short, yellowish hairs 

 on the front surface. Femora black or green, fore and middle pairs 

 broadly, the hind pair narrowly yellow at tip. Middle and hind 

 femora each with one preapical bristle, the latter with pale cilia below, 

 the longest hairs being about as long as the width of the femora, the 

 hairs on their upper edge at base are nearly as long as the cilia below. 

 Tibiae yellow; posterior pair black at tip for one third their length, 

 a little thickened, especially at tip, the glabrous stripe on upper surface 

 distinct and extending over the inner side; they have a row of slender 

 bristles below; bristles of aU the tibiae long and those of the anterior 

 pair more numerous than usual. Fore tarsi (fig. 49) a little longer 



