122 Appendix. 



1 2. Larvae of the fourth generation, found on September 

 22nd, 1872, were divided into two portions : 



A. Placed for pupation in an orchid-house at 12 

 25 R., and allowed to remain there till December. In 

 spite of the high temperature not a single butterfly 

 emerged during this time, whilst pupae of Vanessa C-al- 

 bum and Pyrameis Atalanta, found at the same time, and 

 placed in the same hothouse, emerged in the middle of 

 October. From the middle of December the pupae were 

 kept in an unheated room, and they emerged very late 

 in the spring of 1873, all as Levana: 



On the 6th of June, 7 Levana. 

 8th 2 

 nth 2 

 I2th i 

 I5th 6 

 1 6th i 



_^ 



Total . . 21 



B. Kept in an unheated room during the winter. The 

 butterflies emerged from the 28th of May, all as Levana. 



EXPERIMENTS WITH 

 13. Females of Pieris Rapes, captured in April, laid 

 eggs on Sisymbrium Alliaria. From these caterpillars 

 were obtained, which pupated on 1st 3rd June. The 

 pupae were placed on ice from June 3rd till September 

 IIt h (o 1 R.), and from September nth till Oc- 

 tober 3rd in the hothouse (12 24 R.), where there 

 emerged : 



On the 23rd of October, i female. 

 24th i female. 



M 25th 2 males, i female. 



26th i female. 



28th i male, I female. 



Total . . 3 males, 5 females. 



