Studies on Life-history of Bombycine Moths. 63 



slightly longer and somewhat paler, especially on the 2d and 3d 

 thoracic segments, and on the 5th, 6th, and 7th abdominal seg- 

 ments, but the piliferous tubercles are black, and contrast with the 

 livid black color of the segments. The dorsal tubercles on the 5th, 

 6th, and Tth abdominal segments are situated on a pale straw-yel- 

 lowish field, as seen under a |^-inch objective. 



The shorter hairs on these three abdominal segments bear and 

 are enveloped by drops of a clear fluid; but these drops were not 

 seen on the hairs of the other segments. 



1 was unable to detect on the living larva placed under a i-inch 

 objective the dorsal eversible glands, but I could see five or six 

 bulbous pediculate processes, which are most numerous on the back 

 of the 7th abdominal segment. The fluid envelops the hairs, and 

 is evidently exuded from them ; on the other hand, the hairs situated 

 on the other segments both in front and behind do not exude the 

 fluid. 



End of stage I. — About five days after hatching and just before 

 the first molt. Length 5 mm. The body is now paler than before, 

 livid, and marbled above and on the sides with white, with a yel- 

 lowish patch on the hind edge of the prothoracic segment, which 

 grows wider backwards covering the back (tergum) of the 3d thora- 

 cic segment. On each of the 5th, 6th, and 7th abdominal segments 

 is a dorsal yellowish patch, more distinct than in the early part of 

 this stage. The glandular hairs are as at first, being especially 

 developed on segment 7, where six are seen, and there are no signs 

 of the eversible glands. 



Stage II. — June 6th. Length 4-6 mm. All the larvge with two 

 distinct corai-red eversible glands on the Qth and 1th abdominal 

 segments, and the short dorsal black tufts have appeared The head 

 is still entirely black. The yellow patches on the thoracic and the 

 5th abdominal segment are as before. The piliferous tubercles are 

 still black, the body dull livid, marbled with dull porcelain whitish. 

 A few white hairs arise from the dorsal surface of the thoracic seg- 

 ments, and a few from the dorsal surface of the 2d and od abdominal 

 segments. The lateral tubercles on the prothoracic segment are 

 large and prominent, but there are as yet no long lateral or dorsal 

 pencils, though on the Id and 'id abdominal segments is a pair of 

 short thick dorsal tufts, but none on the other segments. 



On June 7th A. M. the larva had increased to 8-9 mm. in length, 

 and the white hairs were more conspicuous. 



