GRAPTA IV. 



After third moult (length .6 inch), which takes place two clays later, the 

 spines are greatly enlarged and lengthened. In from two to three days further 

 (length .9 inch), the fourth and last moult occurs. From the third moult the 

 larviB vary greatly, both in color of body and of spines. Some are black, finely 

 specked with yellowish; others are yellow-brown, specked with yellow tubercles; 

 others grey-brown with indistinct reddish lines between the spines on the dorsal and 

 two lateral rows and much tuberculated ; others are black with fulvous stripes and 

 profusely covered with yellowish tuberculated spots and points. The colors of the 

 spines A^ary from black to fulvous and green and yellow. From four to five days 

 after the last moult, the length having increased to l.G inch, the larva stops feed- 

 ing and within twenty-four hours changes to chrysalis. Duration of the larval 

 state about fifteen days. 



The chrysalids vary slightly in color, being in shades of brown clouded with 

 olivaceous or lilac; sometimes a dark green stripe from the tail along the spiracles 

 as far as the wing cases; in all, the surface is somewhat bronzed and decidedly on 

 back of head and on the abdominal tubercles, excepting the four middle ones 

 which are silvered; pal])! cases prominent, and mesonotal pi'ocess prominent, 

 arched and thin. Duration of chrysalis state eleven days. 



