506 
ANNUAL REPORT OF NEW-YORK 
4. THE POPLAR. 
AFFECTING THE LEAVES. 
In July, consuming .all the leaf except its coarse veins, and reposing in a 
cavity formed of leaves drawn together like a ball; large black cater¬ 
pillars with white and yellow dots and stripes, and a hump on their 
backs anteriorly and behind. 
The WniTE-S, Clostera albosigma, new species, (plate 2, fig. 4.) 
Several different kinds of singular looking caterpillars, humped 
upon their backs and otherwise closely related to each other, 
occur upon the poplars and willows in Europe and this country. 
Although these insects upon the two continents very much re¬ 
semble each other, the remark made by Dr. Harris appears to be 
correct, that they dilfer essentially in their caterpillar state, and 
their moths also present certain characters, which, on close 
comparison, will enable us to distinguish them. One of our 
species, named the American Clostera by Dr. Plarris, corresponds 
in its marks with the anastomosis, and still more closely with 
the reclusa of Europe; and we come now to present another 
similarly analagous to the curtula and anachoreta. 
The caterpillars attain their full size about the middle of July 
and are then an inch and a quarter in length', black, dotted with 
white above and with numerous wavy white lines on the sides, 
where are two rows of yellow spots, and on the back are four 
dull white stripes alternated with orange yellow on the middle 
of each segment. On the top of the fourth or last thoracic seg¬ 
ment is a conspicuous black hump prolonged into a teat-like 
protuberance and a smaller hump upon the eleventh segment. 
The caterpillar has a cylindrical form, and is clothed with fine white hairs. 
The white lines along each side form divers shaped rings and letter-like marks. 
The stripes upon the hack are interrupted upon the two humped segments, and 
upon the middle of the two segments between the head and the anterior hump 
is a slightly elevated point in each stripe, of a brighter orange color. The an¬ 
terior hump is inclined backward, and is furnished with two long and numer¬ 
ous short white hairs. The breathing pores form a row of broad oval black 
dots along each side, each dot surrounded by a white ring. Above these is a 
row of oblong yellow spots and below them another, each spot having a pimp e 
in its centre from which arises a hair, and the posterior spots of the lower row 
having two of these pimples. On the third and fourth segments, the breathing 
pores being wanting, the two yellow spots are confluent, forming a sing 
large spot with a pimple in its centre. The head is black and the 
