OF NORTH AMERICA. 141 



outer margin than those adjacent. There is in addition a square spot 

 on the discal area, one on the costa opposite to it, besides a very 

 small one at the junction of the discal vein with the median nervules. 

 Tlie extreme apex of the wing is clear ochre yellow ; the veins, 

 especially the fourth median and the last sub-costal, being dark brown, 

 while the latter color prevails extensively around the discal vein and 

 on the outer margin below the apex. Fringes brown, interrupted with 

 yellowish at the termination of the nervules. 



Secondaries very pale yellowish white, sub-diaphanous, immaculate, 

 clothed with yellowish hairs on the inner margin. 



Beneath much as above, but less strongly marked, there being 

 in addition two small brown spots on the costa of the secondaries. 



Expanse of Wings, 1.90 inches; lenglh of body, 0.75 inch. 



Habitat. — Atlantic States. (Coll. generally. ) Canada. (Saunders.) 



Larva. — (Harris' Corr. p. 289.) Body satin white above, dusky 

 beneath, head and true feet black, prolegs dusky ; sides of the body 

 spotted with black, and with black tubercles emitting stellated or 

 divaricating white hairs, the two dorsal series short, truncated and 

 converging, and of a black color from the fourth to the eleventh 

 segments inclusive ; two black pencils on the fourth and tenth seg- 

 ments and a dorsal series of black spots from the fourth to the eleventh 

 segments ; on all these segments the dorsal tubercles are in a double 

 series, viz : two before, nearer together than the others — one-half of 

 the hairs from which are black, and converge in a tuft on the back, 

 and the other hairs are white ; two others more distant, and furnishing 

 only divaricating white hairs. These four dorsal tubercles are trans- 

 verse, or very elongated (almost linear) oval ; the tubercles on the 

 sides are hemispherical. The white hairs on the first three segments, 

 and on the two last, are longer than the rest, and those on the sides of 

 the body are longer than those on the back. The black pencils on 

 the fourth and tenth segments, are longest of all. Rolls up when 

 touched. Aug. 28th. 



"Sept. 18, 1840. Larva white, covered with white hairs in short 

 spreading tufts, a row of eight black tufts on the back, beginning on 

 the fourth segment ; two long, black, pencil-like tufts on the fourth 

 and tenth segment ; four white pencils on the second and third, and 

 two on the eleventh and twelfth segments. Head and prolegs black ; 

 the surface of the body with minute black tubercles, and a transverse 

 black line between each segment. It varies in having the tufts of hair 

 each side of the dorsal black scries dusky." 



