LARE.\''IIIKK—lAUU)l'in)RA. 3.17 



towiird the costa, and i'aiut iiulications of the luarkiug's of 

 the upper side. Hind wings white, with a smoky-blaclc 

 central spot, and also indications of two faint dotted grey 

 transversi> lines. jiody and legs gi'eyish-white ; tarsi 

 darker. 



This species seems to he, as above shown, always variable 

 in respect of the transverse lines in the middle area of the 

 fore wings, [n some specimens in both sexes this area forms 

 a white or creamy-white, almost immaculate, central liand. 

 occupying a large portion of the wing ; and there is almost 

 I'very possiljle intermediate degree of ripjiling of faint oi' 

 more distinct grey lines, till in some individuals these wings 

 .-vre covered throughout with such grey lines, or — especially 

 in those from South Yorkshire — the stripes are broadeiii^d 

 and darkened, and the lines cloudeil with bl.aek in a con- 

 spicuous manner. 



On the wing in May, and in the north in the early part of 

 .lune. 



Lahva moderately stout, skin puckered at the sides; head 

 notched, shining, rounded, pale green with the mouth brown : 

 liody ])ale green ; subdorsal lines pale yellow, conspicuous, 

 the other lines faint or wanting ; divisions of the segments 

 slightly <larker when it is e.xtended, ]ialer when it is con- 

 ti-acted ; undersurface darker green ; anal liap I'urjiished 

 with two small [irojecting points. (Chas. Fenn.) 



•June and -Inly on aspen {Pajtulufi trcmida) and sometimes 

 on white poplar (7'. <illiii), but on the Continent it is said to 

 feed generally on ]io]ilars and sallows : while at rest, during 

 the day. lying flat upon the surface of a leaf. 



I'lU'A short, rather cylindrical, vpry blunt in front, and 

 with short ra])idly tra|)ering s'T'gments behind; limb and 

 antenna-covers compact, almiidantly sculptured with closely 

 inscribed lines : wing-covers swollen in fi-ont. glossy, yet 

 densely covered willi siinilai- incisrd shoi't lines; dorsal and 

 .•ibdominal Sf^'mmts coiir^ch- :ini! thieklv i)it1ed. with the 



