2o6 LEPIDOPTERA. 



below again is a faint greenish-white thread edged with a 

 darker thread of bluish-green, followed by a broad stripe of 

 the ground colour, only faintly marked with the slightest 

 possible trace of a pair of paler threads along the spiracles, 

 which are small, roundish-oval and flesh-coloured, delicately 

 outlined with black ; the skin below them a little puckered 

 and showing a yellowish tint in some places ; undersurface 

 more bluish-green, faintly edged with a darker green than 

 the ground colour ; on either side are two faintly paler ragged 

 lines, also edged with darker green ; the lines of the back all 

 terminate in front of the anal flap, which is light yellowish- 

 green with a sprinkling of most minute black freckles, and 

 the lines are all faint upon the second segment ; freckles also 

 occur on the hinder parts of the anal legs ; a fine short black 

 bristle, only visible under a strong lens, proceeds from each 

 of the usual raised dots. The infant larva is dark olive-brown 

 with pale olive-green head, and whitish dorsal and spiracular 

 stripes ; after the first moult pale greenish-yellow with a very 

 broad darker green stripe on each side ; after the next, olive- 

 green, with several fine equidistant double longitudinal 

 darker lines ; then paler, with the lines hardly visible ; but 

 when half grown having darker lines and an addition of white 

 subdorsal stripes ; when still larger the lines more distinct 

 and the subdorsal white stripe relieved by one of a darker 

 green beneath ; and it is not until after the last moult that 

 the adult colouring is assumed. (Adapted from the long 

 description by Mr. W. Buckler.) 



From the end of May till July, and sometimes the beginning 

 of August ; on birch, sallow, cross-leaved heath {Erica cinerea), 

 and knot-grass ; but Hofmann says on blackthorn and many 

 low-growing plants — Cytisus, Genista, Calhma, Hypericum, 

 Biscutella, and Artemisia. It certainly has no such extensive 

 range of food plants in this country ! 



Pupa of ordinary shape, thickest at the ends of the wing- 

 cases ; plump, tapering rather suddenly to the anal tip, which 



