THE DIPTEROUS GENUS DOLICHOPUS IIST NORTH AMERICA. 69 



black, except a yellow space on their upper surface extending from 

 the knee for one-third, sometimes one-half, their length and shading 

 into the black on the sides of the femora, sometimes the femora are 

 yellow at base even on the lower side; there is also a short, yellow, 

 depressed streak at the apical end of the glabrous stripe on upper 

 edge; inside of the inner row of large bristles is another glabrous 

 stripe; they are gradually but considerably thickened from base to 

 tip. Fore tarsi a little longer than their tibiae; first joint nearly as 

 long as the remaining four joints taken together; fourth joint about 

 equal to the fifth in length, wholly or almost wholly yellow. Middle 

 tarsi a little longer than their tibiae, yellow, becoming slightly 

 infuscated toward their tips. Hind tarsi one and a third times as 

 long as their tibiae, deep black. Calypters and halteres yellow, the 

 former with black cilia. 



Wings grayish (fig. 29); veins j^ellowish brown; costa black, thick- 

 ened at tip of first vein, gradually tapering to its tip; last section of 

 fourth vein moderately bent before its middle; tips of third and 

 fourth veins rather close together; hind margin of wing scarcely 

 indented at tip of fifth vein, evenly rounded, the wing being rather 

 broad in the middle and the anal angle not prominent. 



Female. — Face rather wide, sih^ery white; hind femora not ciliated 

 but with a fringe of little hairs below; fore and middle femora fringed 

 about as in the male, but the hairs scarcely as long; fore and middle 

 tarsi more infuscated; the yellow of hind tibiae more extensive; 

 costa not enlarged at tip of first vein, 



Redescribed from man}- males and females from New York, Illinois, 

 Michigan, and Canada. Melander and Brues report it from Wisconsin ; 

 Aldrich from the White Mountains, New Hampshire. Johnson in 

 Insects of New Jersey from Palisades and Dunnfield, New Jersey. 



Type locality. — New York. 



Type. — In Museum of Comparative Zoology, Cambridge, Massachu- 

 setts. 



No. 30. DOLICHOPUS CALCARATUS Aldrich. 



Dolichopus calcaratus Aldrich, Kansas Univ. Quart., vol. 2, 1893, p. 8. — ^Melan- 

 der and Brues, Biol. Bull., vol. 1, 1900, p. 148. 



Male. — Length, 5-5.5 mm.; of wing, 4-5 mm. Face rather narrow, 

 yellowish brown. Front shining green. Antennae whoU^^ black; 

 third joint somewhat conical in outline, not much longer than wide. 

 Orbital cilia wholly black. 



Thorax green, shining, sometimes with blue, in others with bronze 

 vittae; pleurae more black with gray pollen. Abdomen dark green 

 with black incisures. Hypopygiimi black; its lamellae (fig. 30a) 

 large, oval, but rather truncate at apex, whitish, but sometimes the 

 broad black border shades into the disk so they are mostly brownish, 



