1C2 DIPTERA OF NORTH AMERICA. [1'ART II. 



but difficult to perceive; the cilia of the lateral and inferior orbit 

 are whitish. Upper side of the thorax and of the scutellum pale 

 green, with metallic lustre, covered with rather thick ochre-yelloj 

 dust. Abdomen somewhat darker metallic green, often more gold- 

 green, or coppery-brownish. The bristles at the end of the hypo- 

 pygium are not very long ; its exterior appendages brownish and 

 very small. Coxa? and feet yellow; the first two-thirds of the 

 middle coxa? blackened, the hind coxa? near the basis infuscated. 

 The hair on the feet appears black ; when seen by a reflected light 

 it changes on the tibia? to brownish and on the larger portion 

 of the femora to fallow-yellowish ; the root, a part of the under 

 side of the femora, also the fore coxa? are distinctly fallow-yellow- 

 ish. The tarsi are scarcely a little infuscated towards their tips, 

 though their last joint is of a dark brown color. In the male the 

 pnl villi of the fore and middle tarsi are considerably enlarged and 

 elongated ; the pulvilli of the hind tarsi are much less so. 

 Hal teres and tegula? yellowish with black-brown cilia, which in 

 some directions have a yellowish lustre. Wings grayish-hyaline, 

 on the anterior half usually somewhat yellowish with yellowish - 

 brown veins ; they are rather large and towards the basis a little 

 broader, but their greater breadth is not so near to the posterior 

 margin as in the previous species ; the posterior transverse vein 

 is not nearer to the extreme tip of the wing than it is to its root 

 and the first longitudinal vein reaches scarcely above the first third 

 of the length of the whole wing. 

 Hab. Pennsylvania. 



3. D. spectal»ilis Loew. % . — Aeneo-viridis, femoribus nigris, tibiis 

 tarsoruraque omnium basi flavis, ciliis tegularum nigris, oculis maris in 

 fronte contiguis. 



Bronze green, femora black, tibiae and the root of all the tarsi yellow, cilia 

 of the tegulse black, the eyes of the male contiguous on the front. Long, 

 corp. 0.13—0.17. Long. al. 0.15—0.16. 



Syn. Diaphorus spectabilis Loew, Neue Beitr. VIII, 57. 3. 



Dark metallic-green, thorax and abdomen more bronze-green, 

 the former sometimes more coppery. Face blue-green with thick 

 white dust, which conceals considerably the ground color. Palpi 

 and proboscis black. Antenna? black, small; arista almost com- 

 pletely apical. The eyes meeting upon the front to a large extent 

 and separated only by a very small triangular spot, immediately 



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