OF THE FAKM AND 



butterfly (fig. 18, b) has a black body; the front wings are 

 white, marked above with black at the base, along the 

 front edge, and at the tip; the hind wings are white 

 above and lemon-yellow beneath, but without markings, 

 except a few black scales at the base. 



About the last of May numerous specimens of this 

 species may be seen over cabbage, radish, or turnip beds, 

 or patches of mustard, where, on the under side of the 

 leaves, it deposits its eggs. These are yellowish, nearly 

 pear-shaped, longitudinally ribbed, and one-fifteenth of 

 an inch in diameter, and are seldom laid more than two 

 or three together. In a week or ten days the young 

 caterpillars are hatched; in three weeks more they have 

 attained their full growth, which is an inch and one-half 



. 19. CHBYSALIS. 



long. Being slender and 

 green (fig. 18, a), they 

 are not readily distin- 

 guished from the leaves 

 on which they live. 

 They taper a little to- 

 ward each end, and are 

 densely covered with 

 hairs. They begin to 

 eat indiscriminately on 

 any part of the leaf. When they have completed the 

 feeding stage, they quit the plants and retire beneath 

 palings, etc., where they spin a little tuft of silk, en- 

 tangle their hindmost feet in it, and then proceed to 

 form a loop to sustain the front part of the body in a 

 horizontal or vertical position. Bending its head on one 

 side, the caterpillar fastens to the surface, beneath the 

 middle of its body, a silken thread, which it carries 

 2 



Fig. 18. POT-HERB BUTTERFLY. 



(Pieris okracea.) 

 a, Larva : b, Butterfly. 



