LEPIDOPTERA. 293 



rather smaller, and is a more delicate moth. The color of its 

 body is ochre-yellow ; the fore-wings of the male are purple- 

 brown, with a large colorless transparent space on the middle, 

 near which is a small round white spot, and towards the hinder 

 margin a narrow oblique very faint dusky stripe ; the hind-wings 

 are purple-brown, almost transparent in the middle, and with a 

 very faint transverse dusky stripe ; the wings of the female are 

 purplish red, blended with ochre-yellow, are almost transparent in 

 the middle, and have the same white spots and faint bands as those 

 of the male. It expands from one inch and three quarters to two 

 inches and a quarter, or more in some females. The distinguish- 

 ing name, given by Sir J. E. Smith* to this moth, is pellucida, 

 and we may call it the pellucid or clear-wing Dryocampa. I have 

 only once seen the caterpillar, which was found on an oak on the 

 twenty-fifth of September. It was about the size of that of the 

 senatorial Dryocampa, and resembled it in every thing but color. 

 Its head was rust-yellow, its body pea-green, shaded on the back 

 and sides with red, longitudinally striped with very pale yellowish 

 green, and armed with black thorns. 



The last of these insects is the rubicunda of Fabricius, or rosy 

 Dryocampa. This delicate and very rare moth is found in Mas- 

 sachusetts in July. Its fore-wings are rose-colored, crossed by a 

 broad pale yellow band ; the hind-wings are pale yellow, with a 

 short rosy band behind the middle; the body is yellow; the belly 

 and legs are rose colored. It expands rather more than one inch 

 and three quarters. The caterpillar is unknown to me f . 



All the Moth caterpillars thus far described in this essay, live 

 more or less exposed to view, and devour the leaves of plants ; but 



* Abbot's " Insects of Georgia," p. 115, pi, 58. 



t Only one more North American Dryocampa is known to me. This moth was 

 taken in North Carolina, and does not appear to have been described. It may be 

 called Dryocumj)a bicolor, ihe two-colored, or gray and red Dryocampa. The up- 

 per side of the fore-wings and the under-side of the hind-wings are brownish gray, 

 sprinkled with black dots, and with a small round white spot near the middle, and 

 a narrow oblique dusky band behind it on the fore-wings; the upper side of the 

 hind-wings, and the under-side of the fore-wings, except the front edge and hinder 

 margin of the latter, are crimson red; and the body is brownish gray. The male 

 expands. two inciies and a quarter. The female and the caterpillar of this insect I 

 have not seen. 



