66 THE CANADIAN ENTOMOLOGIST. 



Pupal mortality, none. 



Pupal hybernation, none. 



Of the outcome from the pupae thus obtained previous to winter, the 

 sex was noted of 196, 115 being males, 81 females. 



The pupal term and mature sex of 165 were carefully recorded, sum- 

 ming up as follows : — 



Pupal term nearest 10 days, 2 males, 8 females. 



II n II M 14 II 34 " 



II II 12 II 40 II 21 II 



II II 13 II 37 II 3 II 



II II 14 II 6 11 no II 



Average pupal term of 99 males, closely i2j^ days. 

 II II 66 females, h ii^ m 



The pupations of early dates produced a large excess of males. The 

 earliest 10 pupae, July 23rd and 24th, gave 9 males and i female. From 

 43 pupations dating July 23rd to 27th inclusive, resulted 32 males and 11 

 females. 



Pupae of intermediate dates, especially from July 28th to August 3rd 

 inclusive, gave about equal numbers of both sexes. 



In the later dates the males were again considerably in excess. 



In spring of 1876 \.\no Arctia nais larvae were collected; one gave 

 pupa May i8th and male imago May 31st — pupal term 13 days; the other 

 pupated June 15 th, and female moth emerged June 27 th — pupal term 12 

 days. 



Hybernation of Spilosoma acr^a. 



This moth was rare in vicinity of Galena in 1875. Three larvae col- 

 lected Sept. 19th and one Oct. 21st. 



One made pupa Oct. 8th, the others Oct. 23rd to 25th. Moths 

 appeared the following April, 17th to 26th, 2 males, 2 females. 



The larvae showed no disposition to hybernate, although reaching 

 mature stage so late in the season. 



Spilosoma virginica. 



Larv» collected in September, 1875, spun up late in Sept. and during 

 Oct., and moths emerged the next spring in cool room April 24th to May 

 9th. No observable tendency to larval hybernation. 



Extreme color-variation found among the larvae ; from pale yellow to 

 dark red-brown. 



