322 LEFIDOPTERA. 



the ninth segments, there is an obUqne smoky mark, each 

 mark commencing on the fi'ont of the segment, and extend- 

 ing backwards into the pale spiracular area; the usual dots 

 and spiracles are distinct, black ; ventral surftice green with 

 hne longitudinal white stripes; prolegs tipped with pink. 

 (G. T. Porritt.) 



The Rev. J. Greene, says — Head reddish-brown ; back 

 olive-o-reen, gradually shading off towards the sides to a 

 delicate pink or salmon-colour; a series of oblique lateral 

 stripes of a dark brown, generally six in number, becoming 

 indistinct toward the anal extremity, which is itself purplish 

 bordered with salmon-colour ; body and legs minutely punc- 

 tured with olive-green dots. 



Both these forms are figured by Mr. Buckler, and also one 

 in which for the green is substituted pale brown. 



A very timid larva, usually resting by day in a twisted 

 position, but at the slightest touch falling and hanging sus- 

 pended by a thread. 



June, and a second generation in July or August, or even 

 September ; on sallow and alder. Its time of feeding, how- 

 ever, varies according to the season ; if this is hot the larvo3 

 of the first brood feed up in three weeks, and within another 

 fortnight eggs are again laid ; the resulting larvae usually 

 feed slowly — between two and three months — but occasionally 

 a part, or all of them, go rapidly through their changes, and a 

 third generation of larva3 is feeding in September. In the 

 warm climate of Bournemouth, Mr. Percy M. Bright has, in 

 one year, reared tlurc complete generations, and a portion of 

 a fourth. 



In one of his interesting papers on the colours of larvas, 

 Professor Poulton says that the larva of this species is dark 

 coloured wdien young, and very early takes a position when 

 at rest in which it exactly resembles the excrement of a snail ; 

 the body is twisted into a very irregular spiral, and the 

 illusion is all the more complete because, at this stage, it 

 gnaws the leaf from the surface only, and does not eat from 



