128 LEPIDOPTERA. 



but not attaining either margin, each black streak having 

 attached outwardly a small blotch of rich orange, that nearest 

 the dorsal margin extended along, between the nervures, 

 almost to the anal angle, but interrupted by a short black 

 line of dots which foi'ms part of a normal second line, only 

 indicated by two, three, or four, more indistinct dots ; at the 

 dorsal margin, between the orange blotch and the prominent 

 tuft, is an aggregation of minute black-brown dots ; cilia 

 rather long, white. Hind wings rounded, pure shining 

 white ; cilia long and loose, white. Female with antennse 

 very faintly dentated ; edge of costa white ; otherwise similar. 

 Underside of wings, body, and legs wholly pure white. 

 On the wing in May and June. 



Lakva cylindrical, slightly thicker behind the middle, and 

 with a slight swelling on the back of the twelfth segment ; 

 anal prolegs of normal appearance, but small and usually 

 elevated during repose. Head green, the lobes olive-green, 

 upper portion reticulated with whitish ; body of a delicate 

 green, shining, much suffused with whitish on the back ; 

 dorsal line darker green ; subdorsal lines yellowish and having 

 below them another slender yellowish longitudinal line, be- 

 tween which and the spiracular stripe is a darker green space ; 

 spiracular stripe broad, bright yellow ; spiracles black in a 

 white ring ; under surface deep green ; legs black ; prolegs 

 green, those of the body barred with black. When young 

 o-reener, the subdorsal lines whitish. (Condensed from 

 Buckler.) 



End of June and July, on Birch ; when very young gnaw- 

 ing the surface of the leaves, afterwards eating them in the 

 usual manner. 



Pupa very cylindrical, of almost uniform, moderate 

 stoutness, the thorax slightly keeled, but rounded off at the 

 head ; tail rounded and but little tapering ; a fine punctate 

 roughness nearly all over ; colour brownish- black and rather 

 shining. In a thin cocoon of greenish-grey silk, but tolerably 



