J76 LEPIDOPTERA. 



three such in one day — in some the right hind wing was 

 aborted, in others the left. This occurred in both broods — 

 yet I found no such specimen among those reared from the 

 egg. Mr. J. Jenner Weir met with an example flying, 

 although both its hind wings were absent. 



On the wing at the end of May and in June, and in a 

 second generation at the end of July and in August. 



Larva eloDgate, third segment a little swollen laterally ; 

 head small, flattened, shining black ; face whitish ; skin 

 highly polished ; thirteenth segment bristly and furnished 

 with three very minute anal points ; colour uniform shining 

 hazel-brown, with a series of pale green blotches in a line 

 with, and surrounding, the inconspicuous brownish spiracles ; 

 a faintly paler ventral stripe, and blackish ventral spots ; 

 legs black. 



Or. bright green shaded on each segment with light 

 yellowish-brown, having ill-defined light brown or grey sub- 

 dorsal lines, between which and the spiracular line is a series 

 of oblique brown blotches ; sides of second and third seg- 

 ments purplish-brown ; face green ; undersurface greenish, 

 clouded with pale brown, and having a faintly paler central 

 band. 



Or, yellowish-green, with very faintly indicated paler 

 dorsal, sub-doi\sal, spiracular, and ventral stripes ; head green 

 with a black dash on the summit of each lobe ; legs purplish- 

 black ; first pair of prolegs purple ; anal prolegs green. 



Or. pale green, the sides broadly shaded with hazel- 

 brown, forming an irregular series of pale green dorsal and 

 lateral blotches ; head and legs black, face green ; both pairs 

 of prolegs tinged with dark purplish-brown ; under-surface 

 purplish or hazel-brown, with a paler or greener central 

 stripe. 



All these varieties graduate into each other. (C. Fenn.) 



End of June and beginning of July ; another generation 

 at the end of August and in September ; on birch, sallow, 



