2 FARMERS’ BULLETIN ‘166. 
pores. The surface of the body, if viewed through an ordinary 
hand lens, is seen to be somewhat rough and finely dotted with small 
black spots. It measures, when full grown, about an inch and a 
fourth in length, presenting the appearance shown in figure 1,c. 
It differs from the cabbage looper,’ another caterpillar found on 
such crops, in having five pairs of prolegs (unjointed hind legs) 
instead of four. 
THE BUTTERFLY. 
The butterfly (fig. 2) has a wing expanse of nearly 2 inches. It 
is white, marked with black near the tips of the forewings, as shown 
in figure 1,a@, which represents the female. In the female there are 
two conspicuous black spots on each forewing, whereas the male 
(fig. 2) has only one. Each sex has a corresponding smaller black 
spot at the front edge of the hind wing. The body of the female is 
Tic. 2,—The common cabbage butterfly : Male, wings spread at left, wings folded at right. 
Somewhat enlarged. (Author’s illustration.) 
whitish, but that of the male is usually darker above. The male is 
generally the smaller. The underside of the hind wing is a uniform 
straw yellow of satiny aspect, and there are generally two black spots 
showing through in both sexes. 
THE EGG. 
The eggs are turnip-shaped, pale yellowish, and strongly ribbed 
(fig. 1,0), and may be seen readily with the unaided eye. They are 
deposited singly, usually on the underside of the outer leaves of 
cabbage and their other food plants. 
THE CHRYSALIS. 
When the caterpillar or “ worm” becomes full-grown it attaches 
itself to a cabbage leaf or other near-by object by means of a thread- 
like girdle of silk, and often within the same day transforms to 
the chrysalis (fig. 1,2). The chrysalis is of variable color, being 
1 Autographa brassicae Riley. 
