THE CLOUDED YELLOW 
33i 
days. The larvae rapidly feed up and pupate in about thirty 
days. They remain in the pupal state about eighteen days, 
and the butterflies emerge during the latter part of July 
and August. These in turn pair and lay eggs which pro¬ 
duce a late-autumnal brood should the weather remain 
warm and line. And, like C. hyale, this species is influenced 
by climatic conditions, and is unable to resist the cold damp 
of late autumn and winter, which is fatal to it in any stage ; 
consequently it becomes extinct in this country until fresh 
immigrants arrive on our shores, except perhaps in the 
warmest and most sheltered spots on the south coast, where 
possibly a' few may survive and produce a succession of 
broods. 
As this butterfly lays about 500 eggs after its arrival in 
the spring, it is not sur¬ 
prising that in suitable 
summer weather, after a 
big immigration takes 
place, that this insect oc¬ 
casionally becomes exces¬ 
sively abundant in various 
localities in late summer 
and autumn. 
Egg Laying. The Clouded 
Yellow lays its eggs singly The Clouded Yellow (ah. pallida, var.) 
on the upper surface of the 
leaves of Clover, Lucerne, and other leguminous plants. On 
August 25th some years ago I captured a freshly-emerged 
female C. croccus. On August 27th she laid a few eggs in a 
brief spell of sunshine at 4 p.m. During the following eight 
days, August 28th to September 4th inclusive, she laid eggs 
daily as follows : 100, about 80, about 60, 50, 50, 80, 50 and 
24 ; on the following day she died. Upon dissection I found 
that her abdomen was empty, not a single egg remaining. 
Therefore, owing to her perfect condition when captured, she 
had not, in all probability, deposited; consequently, the 
number of eggs she laid, about 500, is probably the full com¬ 
plement laid by this species. 
Egg. The egg is i’io mm. high, of an elongated ovate form, 
attenuated at both ends, and has about twenty longitudinal 
