68 Studies on Life-hislory of Bombycine Moths. 



which is moderately large, rounded on the sides in front, but angu- 

 lar on each side behind. The rather large tubercles in general bear 

 from one dozen to two dozen spinose hairs. On the 1st abdominal 

 segment is a large conspicuous transverse oval black spot, bearing 

 a piliferous tubercle from which an irregular tuft of black hairs 

 arises, and another on each side of the same segment also sending 

 off a tuft of black hairs. On the 7th segment is a similar large con- 

 spicuous black swollen double wart. There is a large double dorsal 

 black wart on the 8th segment from which arises a double black 

 tuft. There are five black lunate warts on the side of abdominal 

 segments 2-7, and on each of these segments are four "dark greenish 

 dorsal warts arranged in a trapezoid. The dorsal black tufts present 

 in the next stage are not yet indicated, as the hairs in general are 

 pale yellowish. The larva in this stage is a very conspicuous 

 object, but yet very different from the full-fed larva. The thoracic 

 and abdominal legs are blackish, the four pairs of middle abdominal 

 legs paler. 



Stage III. — August 10th to 18th. Length 13 mm. The char- 

 acters of the full-grown larva are attained in this stage. The head 

 is black, as wide as the body, which is now entirely concealed by 

 the hairs, the latter arranged in dense bunches and of unequal 

 length. A few long white hairs arise from the 1st to 3d thoracic 

 segments; the other hairs are straw-yellow, except a row of eight 

 double median doi^sal black tufts, the first and last ones much larger 

 than the others. There is a pair of lateral thick black pencils on 

 the 1st and 8th abdominal segments. The tubercles giving rise to 

 these pencils are surrounded by black, and there is a broad black 

 lateral broken band connecting the black patches on the 1st and 8th 

 abdominal segments; elsewhere the skin is pale. (In one specimen 

 the broad lateral black band is wanting.) The generic characters 

 appear in this stage. 



Final stage. — September 3d, Maine. Length, when at rest, 

 25 mm. Body blackish, densely covered with deep lemon-yellow 

 hairs so that it cannot be seen when the larva is at rest; they are 

 longer on the sides than on the back, so that, as in the other species 

 of the genus, the larva appears a little broader than high. Head 

 black, clypeus and antennae whitish ; the head in general is provided 

 with sparse unequal black hairs. The hairs on the thoracic seg- 

 ments are all lemon-yellow above, and low down on the sides they 

 are also usually yellow, though sometimes black, according to 



