3 I 4 
PIERIDAE 
gradually turns yellower, and on the third day is orange ; 
finally on the fourth day it is deep orange. 
The egg is very similar to that of E. cardamines, but has 
not the transparent apex, and in P. daplidice all the keels run 
the whole length from the summit to the base, while in E. carda¬ 
mines some vanish before reaching the summit. Just before 
hatching, the egg becomes duller in colour and the little larva 
within shows clearly thfough the transparent shell. The egg 
state lasts about ten days in a moderately cool temperature. 
Larva. When fully grown the larva 
measures 25 mm. long. The ground colour 
is a clear lilac ; down the back is a very fine 
and faint line and two rich yellow lines 
along each side. At the base of each leg 
and clasper is an ochreous-yellow blotch 
which forms a disjointed third line. The 
whole surface is densely sprinkled with 
black shining warts, of various sizes, each 
emitting a fine spine. Except for its first 
stage, the larva is similar through all its 
stages. It moults four times. The larval 
stage occupies about thirty days, according 
to temperature. 
Pupa. The pupa measures 19 mm. long. 
It is similar in shape to that of P. napi ; the 
beak is pointed; the dorsal keel is strongly 
angulated, with sub-dorsal angular projec¬ 
tions, and there is a basal wing point. The 
normal colour is a pale lilac-grey, with 
creamy-buff sub-dorsal and spiracular stripes, corresponding 
with those of the larva; a medio-dorsal whitish line, dotted 
with black at the segmental divisions, runs down the abdomen. 
The whole surface is sprinkled with minute black dots ; the 
keel is marked with black, and on each side of the beak is a 
black streak. The wings are buffish, and the nervures are 
speckled with black. The pupa is attached to a layer of silk 
by the cremastral hooks, and by a silken cincture round the 
middle. The pupal stage occupies about fourteen days. 
Imago. The average expanse of the wings is 50 mm. The 
sexual difference is distinct. 
Sixth segment of 
:he larva of the Bath 
White on emergence 
from the egg. 
