Appendix. 



125 



dusting of the veins on the margin of the wings (upper 

 side), could be with certainty recognized as var. Bryonia. 

 The remaining pupae hibernated in a heated room, and 

 gave, from the end of January to the beginning of June, 

 10 males and 5 females, all with the characters of the 

 var. Bryonice. They emerged : 



We here perceive that the tendency to accelerate 

 development through the action of warmth is, in this 

 case, also very different in different individuals. Of the 

 1 6 butterflies only I kept to the normal period of de- 

 velopment from July 2/th to June 3rd, fully ten months ; 

 all the others had this period abbreviated, i male to 

 eleven days, 8 specimens to six months, 4 to seven 

 months, 2 to eight months, and I to nine months. 



