280 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



the first joint. Hind tarsi black from the tip of the first joint, which 

 is usually yellow, but sometimes more brownish yellow. Calypters 

 and halteres j^ellow, the former with black cilia. 



Wings (fig. 205) grayish; costa without enlargement at tip of first 

 vein; last section of fourth vein bent before its middle, the last por- 

 tion straight; third vein bent backward at tip; hind margin of wing 

 scarcely indented at tip of fifth vein, and nearly evenly rounded, so 

 that the wing is somewhat narrowed at its base, the anal angle not 

 being prominent. 



Female. — Face twice as wide as in the male, silvery gray or al- 

 most white; fore tarsi about as in the male, only a little shorter and 

 fifth joint scarcely dilated, they are a little darker in color in my 

 specimens; middle basitarsi without a bristle above; wing about as 

 in the male. 



Redescribed from the type material of terminalis and one of the 

 type specimens of germanus; also specimens from Algonquin, Illinois, 

 (Nason), July 10 and 23; South Dakota; Wisconsin; Grand Island, 

 Erie County, New York, July 23 and August 17; Tonawanda, New 

 York, August 4; Ridgeway, Ontario, July 23-August 13. 



Type locality of terminalis Genesseo, New York, and that of 

 germanus Milwaukee County, Wisconsin (which was described from 

 15 males and 18 females). 



Type of terminalis in Museum of Comparative Zoology, that of 

 germanus in American Museum. 



No. 206. DOLICHOPUS CANALICULATUS Thomson. 



DoKchopus canaliculatus Thoaison, Eugenies Resa, 18G8, p. 512. — Osten Sacken, 

 Western Diptera, 1877, p. 315. 



Male.— hength, 5 mm.; of wing, 4.5-5 mm. Face narrow, a little 

 wider above, silvery white, a little tinged with yellow above. Front 

 green with more or less violet reflections, dulled with thick yellowish 

 pollen. Antennae yellow; third joint blackish, except at base, about 

 one and a half times as long as wide, pointed at tip. Palpi and pro- 

 boscis yellow. Lateral and mferior orbital cilia whitish, more yellow 

 above, about four of the upper cilia on each side black. 



Thorax green; dorsum often with violet reflections, covered with 

 thick yellowish pollen, the median line and lateral edges a little 

 more shinmg; pleurae dulled with gray pollen. Abdomen shining 

 green with coppery reflections on the hind marghis of the segments ; 

 the white pollen on its sides abundant and extending upon the 

 dorsum. Hypopygium black; its lamellae (fig. 206a) large, some- 

 what triangular in outline, with a large and another small emargi- 

 nation on the apical edge, white with the apical corners and narrow 

 upper margin black, lower corner with a branched bristle, upper 

 margin and apical edge as far as the large emargination fringed with 

 black hairs. 



