242 LEPJDOPTERA. 



from the second line to the hind margin. In the late Mr. N. 

 Cooke's collection, in the Liverpool Museum, is one in which 

 the ground colour is of a clear white without markings except 

 sharply black tirst and second lines. In an example in the 

 collection of Mr. H. J. Turner these two lines coalesce below 

 the middle. One taken by myself in Pembrokeshire has the 

 fore wings of a rich soft pale yellow without dusting, but the 

 two lines black, each edged by a clouding of pale chestnut, 

 and the central shade distinctly visible. In the collection of 

 the late Mr. H. Doubleday, in Bethnal Green Museum, is a 

 reddish-grey specimen, and several of a clear grey, without 

 markings Finally, Dr. Mason possesses a very perfect gynan- 

 drous example, its left side male, with well developed wings, 

 the body, moreover, almost as slender as that of a male, but the 

 right side blackened, and the minute flap of a wing just visible. 

 On the wing in February — usually at the middle of the 

 month — but in very forward seasons at the end of January, 

 and in very late ones in March. 



Larva rather squarely built, being stout and of uniform 

 size throughout ; very pale yellow-green, or very pale olive- 

 green, with a yellowish dorsal line, double, but very nearly 

 running into one at the segmental divisions ; subdorsal lines 

 rather paler ; some specimens, in addition, are dotted, with 

 yellowish-white. 



Or — Pale pea-green with dorsal and subdorsal lines like 

 the last, and having an elongated dark brown dash imme- 

 diately below the subdorsal lines, on each segment from the 

 fifth to the ninth. 



Or — Ground colour very pale drab ; dorsal and subdorsal 

 lines pure white ; on each side of the second segment, behind 

 the lobes of the head, is a blotch of dark brown ; down the 

 back, in the middle of each segment, a triple, wedge-shaped, 

 dark brown mark ; and at each segmental division a black 

 spot ; the subdorsal lines bordered, on their undersides^ 

 throughout, with dark brown dashes. 



