146 DIPTERA OF NORTH AMERICA. [PART II. 



3. P. fumipennis LOEW. J. Pedibus flavis, coxis anticis totis 

 concoloribus. 



Feet with the fore coxae altogether yellow. Long. corp. 0.18. Long. al. 

 0.170.18. 



SYN. Porphyrops fumipennis LOEW, Neue Beitr. VIII, 51, 3. 



Female. Bright metallic-green. Face with pale yellowish- 

 gray dust. Palpi black, with yellowish-gray dust. Antennae 

 black ; the third joint small, rounded-ovate ; arista at least three 

 times the length of the antennae. Front blue-green, with a pale 

 yellowish-gray dust. Cilia of the upper orbit black, those of the 

 lateral and inferior white. Thorax with a thin but rather distinct 

 grayish-yellow dust. Fore coxae yellowish with white hair ; on 

 their tips among the white hairs there are a few black bristles, 

 not easily perceived. Middle and hind coxae blackish with yel- 

 lowish tip ; the front side of the middle coxae is clothed with white 

 hair and towards the tip with a few black bristles ; hind femora 

 blackish-brown at the tip ; fore and middle tarsi infuscated, black- 

 ened towards the end ; the last third of the hind tibiae and the 

 hind tarsi black. Cilia of the pale-yellowish tegulae whitish ; 

 halteres pale-yellowish. Wings tinged with brownish-gray ; the 

 last segment of the fourth longitudinal vein gently inflected for- 

 ward upon its middle. 



Hab. Middle States. (Osten-Sacken.) 



4. P. rotund iceps LOEW. $ . Pedibus flavis, coxis anticis conco- 

 loribus, basim versus nigris. 



Feet and fore coxae yellow, the latter in the vicinity of the root, black. 

 Long. corp. 0.16. Long. al. 0.16. 



SYN. Porphyrops rotundiceps LOEW, Neue Beitr. VIII, 51, 4. 



Male. Bright metallic green. Face very narrow, with silvery-' 

 white dust, palpi black with pale dust. Antennae black ; the 

 third joint not very long for a male, rather rounded at the end ; 

 arista about as long as the antennas. Front metallic green. 

 Cilia of the upper orbit black, of the lateral and of the inferior 

 orbits white. Upper side of the thorax bright, with very indis- 

 tinct white-grayish dust. Scutellum in part steel-blue. Abdo- 

 men bright metallic green ; in the vicinity of the lateral margin 

 with rather distinct whitish dust ; the narrow last segment rather 

 steel-blue ; the hair black, on the lateral margin and upon the 



