44 
This caterpillar differs from the common yellow bear in having a 
darker bod}-, and the sides are distinctly ornamented with yellow 
markings. The two species are of about the same length, and the 
hairs present a similar variation in color. A yomig larva is illustrated 
at figure 41, J, a mature one at c. The moths also closely resemble 
each other, but the fore-wings of the present species are strongl}^ 
marked with black, and the abdomen, with exception of the first and 
last segments, is bright ocher above, with black markings. In the 
female the hind- wings are white, like the fore- wings, and similarly 
marked with black, but in the male they are ocher with two black 
dots (fig. 41, a). The life 
economy of these species is 
ver}^ similar; they form the 
same sorts of cocoons and 
transform in an}" convenient 
place where shelter can be 
obtained. In New England 
the salt-marsh caterpillar is 
credited with having a single 
generation, but a little far- 
ther south, in the Middle 
States, two generations have 
been recognized. 
THE HEDGEHOG CATER- 
PILLAR. 
{Isia \_Pyrrharctia] isabellaS. &-A.) 
Another conspicuous cat- 
erpillar known to attack 
beets is shown in the accom- 
panying illustration (fig. 42). 
It is recorded also as affecting 
peas and corn, but appears 
to prefer plantain and other weeds, such as dandelion and burdock. 
The general color of this caterpillar is bright cinnamon red and usu- 
ally" each end is black. The long hairs with which the bod}^ is covered 
are so evenly distributed as to give it the appearance of being shorn 
or cropped. The name of hedgehog caterpillar is derived from the 
habit of this insect of rolling up when disturbed and of passing the 
winter under the bark of trees or in some similar location rolled up 
like a hedgehog. The life history of this insect is very similar to 
that of the preceding. The moth (fig. 42) is dull orange, with the 
fore-wings marked with dusk}^ stripes, both the fore and hind-wings 
being spotted with black, the latter a little paler than the others. 
Fig. 42.— Isia Isabella: male moth above; caterpillar, side 
view, in middle; dorsal view at bottom— somewhat en- 
larged (original, Di^dsion of Entomology). 
