370 LEl'IDOl'TERA. 



species. A curiously difPerent range of variation seems to 

 take place in Irelaml, where some specimens are of a rich 

 deep fifreen, while others have the ground colour greyish- 

 white. .\mong equally beautiful forms found in the Isle of 

 Arraii is one in which the central and other bands are all 

 black-l>rown, divided by narrow stripes of greenish-white, and 

 having scpiared costal s],ots of the same jiale colour. Such 

 are in the collection of ^Mr. L. H. J'rout. 



On the wing in .May and early in -June ; and as a second 

 generation in .July and August, perhaps even in September 

 in the north, but this brood is very partial and uncertain, 

 and the specimens often small. 



Lahva rather thick in proportion, the body slightly de- 

 pressed, of about equal bulk throughout, for it tapers but a 

 very little just at each extremity ; head brown, freckled with 

 darker brown ; ground colour pale purplish-grey or brownish- 

 grey ; back of the second segment black ; the dorsal line 

 through it jjale grey, on all the other segments wider, black in 

 colour, thickest in the middle of each segment, and on some 

 of them suggestive of an elongated diamond ; subdorsal lines 

 rather thick, of the ground colour but well defined, through 

 the dorsal region just above being freckled and suffused 

 with dark purplish-brown, especially about the thickest part 

 of the dorsal line, wliere, on each side of it, an indistinct dark 

 wedge is thus formed with its base on the dorsal line, and its 

 point directed outwards and forwards ; besides the general 

 clouding and darkening of the back there is also a series of 

 black wedges tending to define tiie upper edge of the sub- 

 dorsal line much more clearly ; these are placed at the 

 beginning and end of each segment, the anterior one point- 

 ing backwards, and tiie posterior one forwards, while on the 

 thoracic segments they become united and linear. The 

 sides, so far as the spiracles, are freckled and clouded with 

 dark purplish-brown, and a fine longitudinal line of the 

 ground colour runs through, near the lower margin ; spiracles 



