LIFE-HISTORY OF T. CREPUSCULARIA (OR BIUNDULARIA). 267 
same species which Mr. Barrett (in an interesting article in the 
Ent. Mo. Mag. of September last) tells us ought to be called 
crepuscularia. Be the name what it may, I only wish it to be 
understood that the insect [am about to describe is not a mixture 
of two, but a well-defined species. 
The egg.—In confinement’ the ova are deposited in small 
clusters, rarely singly, and are generally covered lightly with 
scales from the body of the moth. Their shape is elongated 
oval. ‘They appear to have no indentations or marks, and are of 
a beautiful pea-green colour. 
Larva.—The young caterpillar emerges on the fourteenth or 
fifteenth day from the egg, which had changed in colour from 
green to nearly black, and begins to move about very actively. 
At first sight the little caterpillar is black and white, the latter 
colour forming several incomplete rings round the body, and a 
row of conspicuous spots along the lateral area. In three weeks 
the larve begin to show the many variations into which they 
run. ‘They are grey of various shades, some tinged with orange, 
some with brown, some with rusty, while others are suffused with 
mahogany-red. The dorsal area is palest on the anterior and two 
posterior segments. ‘There is a series of undefined pale blotches 
on the lateral area, terminating in a decidedly conspicuous pale 
mark on each side of the anterior clasper. ‘These pale blotches 
display the ochreous yellow or rosy tint, which varies in different 
individuals. There is no evident medio-dorsal line, but the dark 
subdorsal line is seen on segments 4 to 9, ending abruptly on 
segment 4 in a pair of jet-black spots, which, with a trace of the 
medio-dorsal line between them, form a transverse series of black 
spots on the 4th segment. A well-marked velvety dash is placed 
obliquely on each side of segment 6, forming an arrow-head. The 
larva is stout and cylindrical, except that the first three segments 
are drawn together in rest, whilst the 4th segment is decidedly 
swollen laterally, giving the larva a club-shaped appearance, 
something like that of Hurymene dolabraria. ‘The ventral area is 
darker than the dorsal, nearly black in some specimens. It isa 
larva that varies greatly in colour and shade, but it has at any 
rate five constant characters, viz.:—(1) The arrow-head on 
segment 6, (2) the pale lateral blotches, (3) the conspicuous pale 
mark on the side of the anterior claspers, (4) the swollen 4th 
segment, and (5) the three transverse black spots on segment 4, 
