DICRAXOPTYCIIA. 119 



the basis ; the intermediate aud hind ones brown at the tip only 

 (sometimes the feet are altogether of a pale coloring). Abdomen 

 blackish-cinereous, venter paler; genitals yellow. Wings with a 

 pale cinereous tinge, iridescent ; there is, in some specimens, a 

 slightly more brownish tinge along the anterior margin between 

 the tip of the first longitudinal vein and the apex of the wing ; 

 the costa is clothed with black hairs which, in the male, are much 

 longer and form a dense, conspicuous fringe ; all the veins are 

 clothed with moderately long hairs ; pra^furca very short, hardly 

 longer, sometimes evidently shorter, than the discal cell. 



Hob. Washington, D. C. Immature specimens of a paler 

 coloring, with uniformly pale feet, and without any trace of a 

 darker tinge near the apex of the wing, often occur. 



I possess some specimens from Georgia and Pennsylvania the 

 males of which have no conspicuous fringe of hairs along the 

 costa ; the pubescence of their costa is not perceptibly longer 

 than that of the female ; the two basal joints of the antennae 

 seem to be more intensely yellow. This is what I formerly 

 described as D. sororcula ; but I doubt now that it is a distinct 

 species, and place it among the synonyms, until further observa- 

 tion proves the contrary. 



3. D. nigripes 0. S. %. — Femigineo-oc-hracea, femorum apice uigro; 

 alis fulvesceutibus ; pra^furca cellula discoidali nou loiigior. 



Ochraceous, with a reddish, ferruginous tinge ; tip of the femora blackish ; 

 wings yellowish ; prjBfurca not longer than the discal cell. Long, 

 corp. 0.4. 



Syn. Dtcranoplycha nigripes 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1859, p. 218. 



Head cinereous, antonnte black ; two basal joints ferruginous- 

 yellow ; rostrum brownish, palpi black. Thorax reddish-yellow ; 

 pleurae, raetanotum bej^ond the suture, scutellum, and metathorax 

 with a strong hoary bloom ; metathorax darker at the basis ; 

 halteres pale ; coxa? and basis of the femora yellowish-ferrugi- 

 nous, the remainder of the feet is clothed with a dense, black 

 pubescence, which almost entirely conceals the tawny ground 

 color ; tip of the femora black, with a yellow band before it, 

 especially distinct on the front part. Abdomen brownish-yellow; 

 the segments of the venter, from the third to the seventh, have 

 transverse black spots in the middle. Wings tinged with brown- 



