180 GUOTE & ROBINSON. 



male. At base some longer white scales. Medially, the wing is more 

 or less strikingly paler, while terminally, the blackish color spreads in- 

 to an even dark border, with subobsolete, blackish, interspaceal streaks 

 between the nervules and becoming faintly paler. Fringes along in- 

 ternal margin longer, and pure white; along external margin shorter 

 and shaded faintly basally with cinereous. Beneath, as above ; the 

 fringes are more prominently white ; a faint median dark shade-line. 

 IJxpause, 9 ? 1-90 inch. Le.mjth ofhodi/, 0.90 inch. 

 Habitat. — Atlantic District. (New York ! to Pennsylvania !) 

 The discovery of the female of this fine species is particularly inte- 

 resting, as illustrating a sexual difference in the color of the secondaries 

 in Heterocampa. Thus while in H. subalbicans, Grofe, and certain 

 species hereinafter mentioned, there is no prominent difference in the 

 color of the male and female secondaries, we have in II. obliqua. Pack., 

 a great distinction in this respect, so that Dr. Packard's observations, 

 that in H. trouvelotii, Pack., " the secondaries are smoky grey, while 

 in II. obliqua, they are white," only holds good when the male of the 

 latter species is considered. We have compared six specimens ( S S S 

 9 9 9 ) of H. obliqua, which were uniform in appearance when the 

 sexes were separately considered. 



Heterocampa brunnea, n. s. (Plate 4, fig. 2S, 9 •) 



9 . Head, above, prothorax and patagia uniform dull and faintly 

 olivaceous cinereous. Patagia with blackish borders. Centrally, the 

 thoracic disc is dull brownish. Posteriorly, an olivaceous cinereous 

 patch, margined and mixed with blackish scales. Antennae, simple, 

 clothed above with cinereous scales, beconiing obsolete towards the 

 tips, and narrowly subannulate with dark scales. Outwardly the legs 

 are clothed with cinereous scales ; tarsi closely subannulate with black ; 

 inwardly the legs and under thoracic surface are clothed with whitish, 

 hair-like scales. Abdomen, exceeding the secondaries; above, dull 

 obscure cinereous, with a dorsal olivaceous tinge. A narrow, very evi- 

 dent, black central line is continued over anal and preanal segments; 

 on either side of this, sublaterally and laterally, are two similar but 

 much fainter lines. Beneath, paler, becoming dirty whitish towards 

 the base. 



In the shape and style of ornamentation of the wings, this species 

 imitates H. obli(jua. Primai'ics, ashen cinereous. Extreme base, oli- 

 vaceous cinereous for a short space, traversed outwardly by the dark 

 brown, geminate basal half-line, the latter resting inferiorly on a nar- 

 row black furcate streak, which extends from the base of the wing out- 



