22 BUTTERFLIES OF MAINE. 
The larva of this insect feeds on carrot, parsnip, celery, 
caraway etc., of the gardens, and on various wild unbellife- 
rous plants. 
The eggs, which are deposited singly on the leaves of the 
plants, are smooth, nearly globular, and of a delicate light 
yellow color. 
The larva, when first hatched, is nearly black with a broad 
white band across the middle and another on the tail, but 
when fully grown is about an inch and a half long, of a 
bright green color, lighter beneath, and with a transverse black 
band on each segment, and arow of yellow spots on it. 
When disturbed they thrust out from a slit in the top of the 
second segment, a pair of soft yellow organs joined at the 
bottom, somewhat like the letter Y in form. These are 
supposed to be scent organs which serve to drive off the 
insects and birds which prey upon them, 
The pupa is an inch and a quarter long, of a pale green, 
ochre-yellow or ash-gray color, with two short ear-lke pro- 
jections above the head, just below which on the upper part 
of the back, is a little prominence. The pupa is attached by 
the tail to a button of silk, and is supported by a loop of silk 
around the middle of the body. 
This butterfly has never been abundant enough to cause a 
very great amount of injury, but should it attack the garden 
plants in such numbers as to cause much damage, they can 
be reduced by hand picking, and the chickens, if allowed to 
run in the garden, will destroy them. They are generally 
kept down by the birds, and their insect enemies. - 
