B OA RMID. E— TEPHR C ISIA . 191 



produces dark grey specimens, and in South Yorkshire it has 

 been found in rare instances very nearly black. 

 On the wing in May and June. 



Larva of moderately proportionate bulk ; the head has the 

 lobes rounded and is of about the same width as, or a little 

 narrower than, the second segment ; body of uniform width 

 throughout, rounded above, but a little flattened beneath ; 

 segmental divisions well defined, and each segment rather 

 numerously divided transversely into sections, which give 

 the skin a somewhat rough appearance. Ground colour 

 bright apple-green ; head tinged with yellow ; two yellowish- 

 white lines, having a j^ellowish pulsating line between them, 

 form the dorsal stripe ; subdorsal lines yellowish-white ; and 

 there are two other lines of the same colour, but much finer 

 and more indistinct, between them and the spiracular region ; 

 segmental divisions yellow ; undersurface of the same colour 

 as the upper, with pale middle and side lines and the seg- 

 mental divisions yellow. (G. T. Porritt.) 



Another variety, described by Mr. C. Fenn, is dull purple, 

 clouded with darker, with a row of large indistinct whitish 

 dorsal markings, most conspicuous at the incisions ; head, 

 legs, prolegs, and also the undersurface of the second, third, 

 and fourth segments, and the space between the prolegs, dull 

 green ; head dusted with purple ; remainder of the under- 

 surface whitish, with a green tinge ; second and anal segments 

 also tinged with green. 



Mr. W. Buckler has figured it in several shades of green 

 and of purple-brown, also greenish-grej^ 



End of June and July on birch, and occasionally upon 

 alder. 



Pupa nearly half an inch long and moderately stout in 

 proportion ; of the ordinary shape, and tapering to the anal 

 point, which is not very sharp ; the wing, leg, eye, and 

 antenna-covers well defined, those of the antenna3 being 

 conspicuously ribbed. There are also two short but distinct 



