52 THE BOOK OF BRITISH BUTTERFLIES. 



The spiracle, which is black in a red patch, is situated 

 in the yellow spot. The subdivisions of the segments, 

 the tiny warts and the short hairs of P. rapce are repeated 

 in the caterpillar before us. 



The chrysalis (Fig. 36) muc"h resembles that of P. rapa, 

 The ground-colour, however, is light green (sometimes 



pinkish-yellow), some of the points of the keels being 

 yellow. It bears a number of dark brown marks. 



The imago (Figs. 32 and 33) of both sexes is similar to 

 that of the Small White, except for the addition of the 

 green markings along the nervures on the under-surface 

 (Fig. 35), these markings also appearing more or less, but 



