« LEPIDOPTERA. 



of the other lines ; but perhaps the most remarkable range 

 of difference is in the breadth of the space between the first 

 and second lines, this beinu- in some specimens more than one 

 third of the length of the wing, in others greatly diminished 

 and tapering toward the costa, till in a specimen in the col- 

 lection of Mr. S. J. C'apper these two lines coalesce. 



On the wing from the end of May till July, apparently in 

 only one generation. 



Larva. The head is slightly narrower than the second 

 segment, and notched on the crown, it is opaque, rough, and 

 emits a few bristles, yellow-brown ; body dilated at the sides 

 by a very consjiicuous skinfold ; it emits from various parts 

 of its body, more particularly the two extremities, a few 

 scattered stiff and short bristles ; anal segment blunt ; 

 yellow-brown or putty colour, varying much in tint, some 

 specimens being very light and almost unicolorous, while 

 others are traversed throughout by interrupted stripes of 

 dingy smok3--brown, either broken into spots or exhibiting a 

 considerable amount of continuity, but the dorsal surface is 

 generally decidedly darker than the ventral ; spiracles small, 

 black ; there is a pale medio-ventral stripe, rather broad, 

 and intersected throughout by an indistinct but slightly 

 darker stripe ; it is bordered on each side by a very distinct 

 darker stripe ; these two darker stripes unite at the base of 

 the third pair of legs and also between the anal prolegs, thus 

 enclosing the paler ventral space. 



It rests in a perfectly straight and stick -like position on 

 the twigs of its food-plants, the entire ventral surface being 

 appressed to the twig ; when removed it retains exactly the 

 same position, appearing rigid and lifeless, the head prone 

 and the mouth brought into contact with the legs which are 

 crowded together ; but if only [disturbed and [not forcibly 

 removed it will gradually raise its anterior extremity, arch 

 its back, and bend its head beneath its body until it comes 

 into contact with the eighth ventral segment. (E. Newman.) 



