144 DIPTERA OF NORTH AMERICA. [PART II. 



Description of the Species. 



1. P. melampus Loew. % and J .— -Pedibus atris, alis nigricantibus. 



Feet black, wings blackisb. Long. corp. 0.17 — 0.18. Long. al. 0.14 — 



0.15. 

 Syn. Porphyrops melampus Loew, Neue Beitr. VIII, 50, 1. 



Male. Metallic blackish-green. Face very narrow, with white 

 dust, Palpi black with white dust. Antennae black ; third joint 

 rather long and pointed ; arista more than half the length of the 

 third joint. Front black-green, with white dust. Cilia of the 

 upper orbit black, those of the inferior snow-white. Upper side, 

 of the thorax shining, only on the anterior and lateral margin with 

 more distinct white dust ; on the former the beginning of two 

 darker colored lines is perceptible. The scutellum has no hair 

 besides the usual bristles. The bright and dark-green abdomen 

 has scarcely a trace of white dust ; its last segment is almost black. 

 The hypopygium is a little larger than in most of the other spe- 

 cies of this genus, bright black ; the outer appendages are ex- 

 tremely small black lamellae fringed with black hair ; the brown 

 interior appendages are also small, turned a little upwards at the 

 end, but pointed and upon the middle of the lower side fringed 

 with a few hairs. The hair upon the abdomen is black, only on 

 the lateral margin of the anterior segments and upon the venter 

 whitish. Coxas black, with a rather thick white powder, the fore 

 and middle coxae with considerable white pubescence and without 

 any black bristles. Feet black; femora with a trace of blackish- 

 green lustre ; the tip of the trochanter, the tip of the knee, also 

 the extreme tip of the fore and middle tibiae brownish-yellow ; the 

 first joint of the fore tarsi a little longer than the three following 

 together, at the end of the under side dilated almost in the shape 

 of a tooth ; otherwise the feet have no particular distinction. The 

 cilia of the pale-yellowish tegulse have whitish hair. Halteres 

 pale-yellowish. Wings blackish, in the vicinity of the second 

 half of the anterior margin rather black ; the last segment of the 

 fourth longitudinal vein only very little inflected forward in the 

 middle. 



Female. The only specimen which I have before me, strikingly 

 differs from the described male in the color of the body ; as all the 

 other characters coincide perfectly with those of the male, I have 

 not the least doubt that both belong together and consider the 



