( 



that we are almost entirely dependent on immigration for 

 our supply of P. atalanta. 



Comm. Walker sai'd that at Gibraltar this species was 

 almost continuous-brooded, and suggested that some of the 

 winter specimens found in Britain might be immigrants blown 

 over by prevailing south winds. 



Mr. Merrifield observed that in his temperature experi- 

 ments he had never been able to keep pupae of P. atalanta 

 alive for more than 10 or 11 weeks, either out of doors, or at 

 a temperature of 33, and later of 50 degrees and upwards. 



A LARGE FAMILY OF ACRAEA ENCEDON, L., BRED AT DURBAN 



PROM A KNOWN FEMALE PARENT. — Prof. PouLTON exhibited a 

 portion of this family kindly sent to him by Mr. E. E. Platt, 

 who had conducted the experiment. 



The female parent, of the encedon type form, was taken on 

 Mar. 8, 1914. One batch of ova was laid under a leaf of 

 Commelina on the following day, and another batch on Mar. 

 10, after which the female parent unfortunately escaped. 

 The larvae commenced hatching. Mar. 17. The brood being 

 somewhat unmanageable, about 220 half-grown larvae were 

 liberated. The first pupation took place on April 15, and 

 the dates of emergence from pupae produced by the larvae 

 reared in captivity were as follows : — 



Totals 95 44 54 35 



The early emergence of the males and their great numerical 

 preponderance over the females, 149 to 79, were very obvious 



