POPLAR CATERPILLARS. 463 
teeth, making a deeper and narrower sinus above the vein than in C. unijuga. Sub- 
terminal line upright, dentate, the shade preceding the blackish line distinct. Ter- 
minal line appearing as black lunulated interspacial marks. Hind wings bright red, 
somewhat pinkish. The black mediau band is straight, not regularly curved as in 
C. parta, and straighter than in C. unijuga, rather narrow, uo where greatly exca- 
vated, rounding and narrower on the interspace between veins 1 and 2 opposite the 
excavation of the marginal band, arrested at vein 1, but a few blackish scales mark 
its continuance towards the internal margin. Marginal band narrower than in 
C. unijuga. Ciliae white, with a few red scales at base, especially at the apices. 
Beneath, the median band of the hind wings is narrower than above, with the same 
peculiarities, constricted at veins 2 and 5, and continued by scattered scales beyond 
vein 1. Expanse of wing 78 mm (Grote). 
38. Catocala relicta Walker. 
The caterpillar of this moth is said by Mr. Hulst to feed on the silver 
poplar and white birch. The moth has white fore wings which are 
more or less powdered and shaded with black ; it is easily recognized 
by the even white median band on the otherwise black hind wings. 
It expands 80 to 85 mm . (Hulst.) 
Moth. — Male. Black, speckled with white, white beneath. Thorax in front white, 
with black bands. Abdomen above blackish, whitish between the segments, and 
with a white apical tuft. Forewings with two white bands, which include a black 
white-speckled band, and the latter is interrupted in the middle by a black ringlet; 
the exterior band contains a zigzag transverse black line ; exterior border and ad- 
joining part almost white, with deep black marginal lunules. Hind wings blackish 
brown, with a regular curved white baud and with white ciliae. Length of body 
14 lines ; of the wings 32 lines. (Walker). 
39. Catocala unijuga Walker. 
Two caterpillars of this moth were obtained by Dr. D. S. Kellicott at 
Buffalo, N. Y., from the trunk of a Populus eandicans. "They had 
passed their last molt when taken ; although they continued to feed 
in confinement for five or six days they increased in size but little dur- 
ing that time ; their habits were strictly nocturnal. When first 
observed they were clinging to the bark beneath a limb, lying obliquely, 
and so flattened and leach-like that together with their gray color and 
lateral fringes blending with the bark, they were difficult objects to 
discover. June 22 the larvae ceased to feed. On the following day 
they had fastened together some leaves by means of a silken gauze, 
brownish in color; by the 26th both had transformed." The moths ap- 
peared July 15. (Can. Ent., xiii, p. 38.) 
Larva. — Body attenuated towards each end, especially towards the head. The gen- 
eral color is gray above, below pink with a subelliptical black spot to each segment, 
those on the thoracic rings not conspicuous. The head flattened, slightly bilobed, 
lighter in hue than the body and bordered by a well defined black line. The lighter 
head lobes under a hand lens appear mottled and reticulated with black lines and 
blotches. Tbe dorsal line is white, made up of patches, illy defined circles and -spots 
alternating; on each ring on either side of the line are two white papillae from each 
of which arises a white hair; above the stigmata there is a white interrupted line, 
below them a black line also interrupted. The stigmata are rather large, elliptical. 
