Studies on Life-history of Bomhycine Moths. 85 



trapezoidal manner. The two median ones are hemispherical, situ- 

 ated on each side of the median line, the opposing sides being straight 

 and parallel. There are four lateral warts ; the upper one much 

 larger than the others; the 2d minute, situated behind and below 

 the uppermost; the 3d and 4th are narrow and long, the 3d being 

 situated directly beneath the 1st. 



On the 9th abdominal segment the four piliferous warts of the 

 other segments are coalesced into two large flattened v/arts, each 

 bearing three setae. On the 10th and last segment is a large dark 

 suranal plate with irregular edges, bearing on each side 3 to 4 hairs. 

 All the warts are dark horn-color, and most of the hairs arising 

 from them are dark, some almost blackish, and about half as long 

 as the body. 



Stage II. — Molted August 18tb to 20th. Length 5 mm., becom- 

 ing August 25th 7 mm. in length. The head is black, rounded, not 

 so wide as the body. The prothoracic shield as in stage I. The 

 2d and 3d thoracic segments each with two large widely separate 

 dorsal black warts, bearing about 14 hairs of unequal length, both 

 white and black, the longest of which are about one-quarter as long 

 as the body. On each side are two lateral tubercles, slightly larger 

 than the homologous ones on the abdominal segments, these, espe- 

 cially the upper one, on the 2d thoracic segment being larger than 

 the corresponding one on the 3d thoracic segment. 



On the abdominal segments (uromeres) are four dorsal piliferous 

 tubercles arranged in a trapezoid, of which the two middle ones are 

 sublunate, the others round ; the former bear 2-3-4 short fine hairs ; 

 the round ones from four to five longer and thicker hairs. 



The body is chestnut-brown, but the warts are surrounded by 

 pale carneous spaces ; and the hairs above dark brown, becoming- 

 gray on the sides. There is a broad irregular brown dorsal band, 

 and a broad irregular lateral chestnut-brown band, below and above 

 which the body is pale whitish flesh-color, the flesh-colored lines 

 afterwards forming the two lines so distinct in the next stage. The 

 lower of these pale bands become towards the end of the stage a 

 distinct, lateral white line, broken at the sutures; it surrounds the 

 base of the third lateral tubercle, while the fourth and lowest tuber- 

 cle is surrounded at base with an irregular whitish ring. This infra- 

 spiracular line remains white throughout this stage. 



The thoracic legs are chestnut-brown ; the abdominal legs pale 

 chestnut, the plantae still paler. 



