196 



INSECT LIFE. 



plants, including apple, plum, and the more common 

 forest trees. When full grown it measures from 

 three to four inches in length, and is dull bluish green 

 in color. The body is armed with six rows of tuber- 

 cles, extending nearly its entire length, and there is 

 an additional short row on each side of the ventral 

 aspect of the first five segments following the head. 

 The tubercles on the second and third thoracic seg- 

 ments are larger than the others, and are coral red. 

 The other dorsal tubercles are yellow, excepting 

 those of the first thoracic and last abdominal seg- 

 ments, which, with the lateral tubercles, are blue ; all 

 are armed with black bristles. The cocoon (Fig. 



Fig. 160. — Cocoon of the Cecropia-moth. 



160) is securely fastened to a branch of the food 

 plant, where it is easily found during the winter 

 months. 



The Ceanothus Silkworm, Samia califomica. — 

 The Cecropia-moth is not found on the Pacific coast, 

 but its place is taken by a closely allied species simi- 

 lar in size and markings, but differing in having the 

 ground color of the wings reddish or dusky browm. 

 The larva feeds on Ceanothus ; the cocoon resembles 



