LÉPIDOPTÉROLOGIE COMPARÉE 173 



its proper food 111 a state of nature from the fact of both larvae, 

 and imago being alvvays on the low-lying boggy parts where 

 the beaked rush most abounds, whereas, on the higher commons, 

 which are covered with cotton grass, neither the larva nor the 

 butterily has been seen. It is also recorded that the habits of the 

 larvae differ much from those of the allied species in being parti- 

 cularly active and Hvely, traveUing much over their food plant; 

 " an all-vv^ise provision enabling them to escape the inundations 

 to which they are liable. " 



I am able, however, thanks to the kindness of my entomolo- 

 gical colleague, Mr. F. W. Frohawk, to publish now for the flrst 

 time a detailed account of the complète. 



Life History of CŒNONYMPHA TIPHON 



" The egg is large for the size of the butterfly, being 1/32 in. 

 high, of an elliptic-spheroid form, vv'ith a swoUen micropyle which 

 has a very hncly reticulated surface, the reticulations increasing 

 in size over the rest of the crown and developing into irregular 

 longitudinal keels down the side, which disappear on rounding 

 the base; thèse number about hfty altogether. The spaces 

 between the keels are hnely ribbed transversely. The colour 

 when first laid is whitish ochreous-green, which turns to a 

 pale straw yellow, and pale ochreous-brown spots appear under 

 the shell, which gradually become more pronounced, and form 

 an irregular pattern of small blotches and a more or less broken 

 band, forming an irregular zone. The shell then becomes opa- 

 lescent, having a bluish refiection in a high light. 



" The egg is laid singly on the blade or stem of grass. The 



' larva escapes from the egg by eating away the shell in a line for 



about two-thirds of the circumference just below the crown; it 



then forces itself out, the crown acting like a lid. The egg state 



occupies about fifteen days. 



