340 DIPTERA OF NORTH AMERICA. [PART II. 



Gen. XX. PORPHYROPS. 



5. P. longipes LOEW. . Viridis, facie alba, coxis ex viridi nigris, 

 pedibus anterioribus flavis, ultimis tarsorum articulis nigris, pedibus 

 posticis nigris, femorum basi tibiisque supra (basi tamen excepta) 

 testaceis, apice harnm tarsisque fuscis, exterioribus hypopygii appen- 

 dicibus filiforrnibus, bipartitis. 



Green ; face white ; coxae black-green ; the four anterior feet yellow, the 

 last joints of the tarsi black ; the basis of the femora and the upper side 

 of the tibise, with the exception of the tip, brownish-yellow, the tip of the 

 tibiae and the tarsi brown ; the exterior appendages of the hypopygium 

 linear, bipartite. 



Long. corp. 0.26. Long. al. 0.21. 



SYN. Porpliyrops longipes LOEW, Berl. Ent. Zeitschr. VIII, 95, 92. 



Dark green, shining ; thorax with two narrow approximated 

 dark streaks. Front covered with white dust. Antennae black ; 

 the third joint lanceolate ; the arista a little shorter than the 

 antennas. The narrow face white. The lower part of the occiput 

 clothed with dense yellowish hair. Abdomen above with black, 

 on the sides with yellowish-white hairs. The exterior appendages 

 of the hypopygium dusky yellowish, linear, bipartite, and beset 

 with delicate whitish hairs. Fore feet yellow ; the two last joints 

 of the tarsi black ; the tip of the preceding joint black-brown ; 

 the fore femora upon the latter part of the upper side, blackened ; 

 the tip of the first joint of the fore tarsi incrassated, almost denti- 

 form on the under side. Hind femora black with brownish-yellow 

 basis. Hind tibiae and hind tarsi comparatively stout ; the tibiae 

 black, on the upper side, with the exception of the tip, brownish- 

 yellow or yellow, the tip brown ; the tarsi brown, their tips black. 

 All the feet longer than in most of the other species of Porphyrnpa. 

 All the coxae greenish-black with a pale pubescence ; the middle 

 ones, at their tips, with black, approximated bristles, forming a 

 tuft, not unlike a thorn. Tegulae yellowish, with whitish cilia. 

 Wings tinged with brownish-gray and with blackish-brown veins ; 

 the end of the third longitudinal vein gently curved downwards ; 

 the last segment of the fourth longitudinal vein inflected. 



Hab. White Mountains, New Hampshire. (Osten-Sacken.) 



