ZooL.— Vol. II.] WHEELER— DOLICHOPODIDM. 33 



reflections near the bases of its segments. Hypopygium small, black, embed- 

 ded, provided with four black bristles which project backwards. Pleurse, 

 coxae and legs black, femora with metallic green reflections, tibiae and all but 

 the tips of the fore and middle metatarsi yellow. Fore tarsi plain, first joint 

 as long as the second to fifth joints taken together. These latter are very 

 short. None of the pulvilli are enlarged. Wings hyaline with black veins 

 which become brownish towards the base; costa ending at the third vein 

 which runs near the second and terminates very near the tip of the wing. 

 Fourth vein delicate but complete throughout; its tip bends downward and 

 ends behind the tip of the wing. Posterior cross-vein near the base of the 

 wing as in other species of the genus. Halteres and tegulae yellow, the latter 

 with pale cilia. 



Female. Length 2.5 mm.; length of wing 2.25 mm. Face but little 

 broader than that of the male. Thorax with golden instead of violet reflec- 

 tions. In other respects the coloration is that of the male. The second 

 joint of the antenna has a much shorter overlapping projection than in the 

 male; the third joint is scarcely longer than broad, rounded, terminating in a 

 blunt point; the arista is distinctly dorsal but shorter than that of the male. 



Three specimens of this interesting species received from 

 Mr. C. W. Johnson; two males labelled New Bedford, 

 Mass., July 15, 1896, and a female from Avalon, N. J., 

 taken July 22, 1894. There is scarcely a doubt that the 

 two sexes belong to the same species. Another male spec- 

 imen collected by L. E. Hood at E. Boston, Mass., was 

 gent me by Mr. Samuel Henshaw. 



Porphyrops Loew. 



In the following amplification of Loew's table of North 

 American species of Porfhyro^s, all the described forms 

 are included with the exception of Walker's Porfhyrofs 

 pilosicornis. This species has not yet been recognized and 

 Walker's description of the antennal arista as "proceeding 

 from the base of the third joint and more than twice its 

 length" makes it very doubtful whether it is a Porphyrops 

 at all. 



1. Feet black melampus Loew. 



Feet yellow 2 



2. All the coxae completely black or greenish black 3 



Coxae more or less yellow 4 



3. Middle coxae with black bristles at tip longipes Loew. 



Middle coxae without black bristles at tip. .'. . . .nigricoxa Loew. 



4. Fore coxae not blackened at the base fumipennis Loew. 



Fore coxae blackened at the base 5 



(3) Sept. 15, 1899. 



