GARDEN INSECTS 



283 



hatch in four to eight days. The eggs are yellowish, prom- 

 inently ridged and laid singly on end. The larvae gorge 

 themselves on the foliage and grow rapidly, becoming full 

 grown in from ten days to two weeks. When mature they 

 are about li inches long, of a velvety green color, very sim- 



FIG. 203. The cabbage butterfly (Pontia rapci). (After Chittenden, 

 U. S. Dept. Agr.) 



a, female butterfly; b, above, egg as seen from above; below, egg as seen from 

 side; c, larva in natural position on cabbage leaf; d, suspended chrysalis o, c, 

 d, slightly enlarged; b, more enlarged. 



ilar to the foliage, with a faint yellow stripe down the middle 

 of the back and a row of yellow spots on each side. The 

 chrysalis or pupa is attached to the leaf by a strand of silk 

 and is at first greenish and then light brown in color. In 

 the summer the butterflies emerge from the chrysalids in 

 one to two weeks, but the chrysalids of the last generation 



