Ji8 LEFIDOPTERA. 



Dr. Riding' has obtained, in successive years in the same dis- 

 trict, many specimens in which this disoal spot is absent 

 fi'om tlie fore wings, and a few in which, as iti Mr. Hellins' 

 specimens, it is obsolete also in the hind. 



On the wing in 3[ay and the beginning" of June ; and as a 

 partial second generation sometimes as early as the end of 

 June, but usually at the end of July and in August. 



Larva cylindrical and of almost uniform bulk tlirouo-hout, 

 the ninth, tenth, and eleventh segments very slightly broader 

 than the remainder ; head broader than the second segment, 

 with the lobes rounded and the face flat, chocolate-brown 

 with paler markings ; skin smooth ; segmental divisions well 

 defined ; ground colour clear velvety dark green ; dorsal line 

 yellow, commencing on the head, and conspicuous through 

 the dorsal area ; subdorsal lines waved, also yellow, as are 

 the subdorsal region and the segmental divisions ; spiracles 

 and raised dots distinct, black ; ventral surface pale green, 

 with small black tubercles, segmental divisions black. 

 (G. T. Porritt.) 



A variety figured by Mr. Buckler has the ground colour 

 pale brown, with similar markings; he, moreover, figured 

 his green larva with a ///w //, head. It is certainly known 

 that this species, like many others, is dimorphic in the larva 

 state, the alternative colours, as in several other species, 

 being green and brown. 



June and sometimes the beginning of July, and as a ]iartial 

 second generation at the end of August and in September ; 

 on maple (Acer canvpcdfis) and as a substitute, in confine- 

 ment, on sycamore ; but 1 find no evidence of its occurrence 

 upon sycamore in a natural state. There is some reason to 

 suppose that it may occasionally feed on hornbeam. 



Pupa very like that of a little butterfly ; sharply squared 

 in front, with a projecting point at each shoulder ; the front 

 portion rather flattened ; gently tapering throughout to the 

 anal tip ; limb and antenna-covers shining, sharply defined 



