229 THE CANADIAN ENTOMOLOGIST. 
On the under surface the yellow colour is less bright, while the dark 
margins are either entirely wanting or else represented by a dusky shade 
margined occasionally within by a few dull brownish dots. The spot on 
the forewings is distinct, but paler and usually centered with a small silvery 
eye. That on the hind wings is much more distinct than above, being 
composed of a bright silvery spot in the centre defined by a dark brown 
line which is in turn encircled with dull orange. Immediately above and 
a little towards the outer edge is a much smaller spot of the same 
character ; there is also a reddish dot on the anterior edge, about the 
middle of the wing. The antennæ are pink, with the knobs at their tips 
of a darker shade; the body is dark above, paler at the sides and 
underneath. 
This insect appears first on the wing about the middle of May, 
becoming more plentiful towards the latter end of the month, but the time 
of its greatest abundance is later in the season, during the latter part of 
July and throughout August. In the second volume of the ENToMoLo- 
GIST, p. 8, Mr. Bethune remarks as follows: ‘ On the 3rd of August, a 
lovely, bright, warm morning, after an excessively wet night, I drove about 
ten miles along country roads ; every few yards there was a patch of mud, 
the effects of the heavy rain, and at every patch of mud there were from 
half a dozen to twenty specimens of Colias philodice, at least one I should 
think for every yard of distance I travelled. I must then have seen, at a 
very moderate computation, about ten thousand specimens of this 
butterfly.” 
The caterpillar of the Clouded Sulphur feeds on the cultivated pea; on 
clover, on the Blue Lupin, Zwpinus perennis, and no doubt on many 
other plants belonging to the order Leguminos@. The egg is about one 
twenty-third of an inch in length, tapering at each end, with twelve or 
fourteen raised longitudinal ribs, with smaller cross lines in the concave 
spaces between them. Their colour when first deposited is of a pale 
lemon yellow, which changes in three or four days to a pale red, then 
gradually to a bright red, and from that to dark brown just before the 
time of hatching. The duration of the egg stage is about seven days. 
The young caterpillar just hatched is one-twelfth of an inch long and 
of a dull yellowish brown colour, but when a little older it changes to a 
dark green. When full grown it is about an inch long, with a dark green 
head and body, the latter with a yellowish white stripe on each side close 
