EASTERN UNITED STATES. 179 



vated. They are pale green, conoidal, depressed at the 

 top and rounded at the base. The lower half is indented 

 like the surface of a thimble, the upper half has about 

 fifteen ribs. They hatch in from four to seven days. 



The young larva is yellowish green clouded with 

 brown, with a dark brown head. It is covered with 

 scattered black hairs. 



After the first moult the larva is armed with seven 

 rows of short, fleshy, brown spines, each thickly set with 

 short concolored bristles; also at the base of body a 

 row of small spines. Body striped longitudinally with 

 light and dark brown and sordid white. Head subcor- 

 date, the vertices rounded ; two gray bands, the rest 

 black. There are but few changes after the second and 

 third moults. 



The mature larva is .85 of an inch long, with a cor- 

 date, shining, bronze-colored head, having two oblique 

 white stripes on each side and a spot of the same color 

 above the mouth. The body is dark brown dotted with 

 yellow, and has seven rows of tapering fleshy spines 

 armed with blackish bristles. 



The first brood passes four moults before reaching 

 maturity, when it changes to a chrysalis, from which the 

 imago emerges in from seven to thirty days. The larvae 

 of the second brood pass three moults, when they become 

 lethargic and hibernate. In the spring they revive, go 

 to feeding, and moult twice more before reaching ma- 

 turity, the chrysalides from these producing the butterflies 

 in from one to two weeks. 



The chrysalis is about half an inch long, cylindrical, 

 with a deep depression back of the mesonotum, and 

 several rows of fine tubercles on the abdomen. The 



