44 



This caterpillar differs from the common j^ellow bear in having a 

 darker body, 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 ^'oung- 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 stronglv 

 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 similarl}^ 

 marked with black, but in the male they are ocher with two black 



_ dots (fig. 41, a). The life 

 economy of these species is 

 very similar; the}" form the 

 same sorts of cocoons and 

 transform in any 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- 

 PIIiLAR. 



{Ism [Pyrrharciia'] isabellaS. & A.) 



Another conspicuous cat- 

 erpillar known to attack 

 beets is shown in the accom- 

 panjang 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 body 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 dusky stripes, both the fore and hind-wings 

 being spotted with black, the latter a little paler than the others. 



Fig. 42.—Isia isabcUa: male moth above; caterpillar, side 

 view, in middle; dorsal view at bottom— somewhat en- 

 larged (original, Division of Entomology). 



