52 LEPIDOPTERA. 



base ; the markings all broader and the pale ones whiter. 

 Hind wings whitish tinged with faint brownish ; nervures 

 pale brown ; central transverse stripe dark brown, but in 

 some instances hardly visible ; outside it is the dark brown 

 blotch followed by two white blotches toward the apex, and a 

 faint, connected row of pointed dashes of a tawny colour. 



Underside of the fore wings of the male dull pale tawny, 

 with the transverse lines and central black spot indistinct 

 and the whitish clouding absent, but the white sub-apical 

 spots very distinct ; hind wings brighter tawny, with the 

 anterior margin whitish, the central transverse stripe, and 

 another near the base, both black, central lunule blackish, 

 and the brown and white ajDical blotches conspicuous ; besides 

 these there are faint dark-brown clouds near the hind margin ; 

 legs black ; leg-tufts and body fulvous, except the abdominal 

 portion, the centre of which is whitish. Underside of the 

 female a repetition of the upper, but fainter in the fore wings, 

 more distinct in the hind. 



Variation appears to exist only in the intensity of colour 

 and of clouding, but in some individuals the darker clouding 

 is almost absent. In the collection of the late Mr. H. Double- 

 day is a very dark male ; and in that of Mr. F. Bond a female 

 with the hind wings nearly white. As a rule specimens 

 from Scotland are of deeper, richer colour than those from 

 the South of England. 



On the wing in April, or even sometimes at the end of 

 March, bat in the north as late as the beginning of May. 



Larva much like that of a hawkmoth. Smooth and naked ; 

 stout behind, but tapering from the sixth segment to the 

 head, which is quite small ; twelfth segment with a singular 

 pyramidal upright tubercle. Head pale green with white 

 stripes ; body pea-green with a slender, darker green dorsal 

 line, and, sloping away from it, a series of broad oblique 

 yellow dorsal stripes, edged with dark-green lines, proceeding 

 half way down the sides, or even, in some cases, as yellow 



