66 N. S. ENTOMOLOGICAL SOCIETY 



placing of the central, black, plumed hairs of the subspiracular 

 row (IV). The form most commonly met with, bears a single 

 hair of this type in every tuft of the subspiracular row, with the 

 exception of the first abdominal, which bears two, and none in 

 the tufts of the supraspiracular row. Out of 36 specimens ex- 

 amined, 17 answered this description. Of the remainder, the 

 following variations from this type were noted: 



Three had an additional hair on first abdominal tuft. Six 

 had two on the second and third thoracic segments and three 

 on the first abdominal. Two had one on the first abdominal 

 segment of the supraspiracular row (III). One had a single 

 hair on the fifth abdominal segment of the supraspiracular row 

 (III). One had two on the second thoracic, three on the third 

 thoracic and four on the first abdominal segment. One had 

 three on the first abdominal, two on the second abdominal and 

 one on the fifth and sixth abdominal segments of the supraspirac- 

 ular row (III). One had two on the third thoracic and two on 

 the third abdominal segments. One had four on the first ab- 

 dominal and five on the third abdominal segments. One 

 specimen had all those found in the typical form together with 

 an additional hair in the first abdominal tuft of the subspira- 

 cular row and a single one in each tuft of the supraspiracular 

 row (III), forming two complete rows all bearing these hairs. 



Body, greyish in color, marked with black; head, shiny 

 black; eversible glands, coral red; spiracles, whitish or yel- 

 lowish mixed with black; thoracic legs, black; prolegs, greyish; 

 under surface dull black. 



Black lateral hair pencils of first thoracic Segment, 10 m. m 

 — 12 m. m. of last abdominal, 8.5 m. m. -10 m. m. Length of 

 body after last larval moult, 20 m. m.-25 m. m. Head 3.75 

 m. m.-4.25 m. m. in width. When full grown and ready to 

 pupate, the larvae measure about 30 m. m. in length. 



The Cocoon. 



The cocoon is a loosely woven structure, composed chiefly 

 of hairs from the body of the larva. The exuvium, cast out by 

 the larva after its last moult, remains attached to the caudal 

 extremity. The female cocoon, which is rather more loosely 

 woven than that of the male, measures 20 m. m.-21 m. m. in 

 length, and the male, 16 m. m.-19 m. m. in length. Pupation 

 taking place from two to three days after spinning. 



