188S.] 101 



pinkish or to a light brownish tint, showing a deeper brown spot at one 

 end, and by that time the egg has become very plump. 



The larva, when first hatched, is of a short dumpy figure, with 

 small black and glossy retractile head, the second segment bears a 

 glossy brownish plate having a broad black dotted streak tapering to 

 a point at the front, and on either side a black streak ; the other seg- 

 ments of the body are faintly tinted with greenish drab, and covered 

 with a short fine whitish pubescence ; after seven days' feeding it 

 re-appears fat and plump, the pubescence less noticeable, more of the 

 skin visible and glistening as it sits still on a leaf. 



After the first moult while quietly resting it appears to be a mass 

 of bristly tubercles, and of a fresh light green colour, but by the time 

 it has again ceased feeding and is laid up on a leaf for the next moult, 

 the glistening skin has a greenish-buff tint, as from its plumpness the 

 bristles are farther apart and allow this to be seen. 



After the second moult it is still fresher and greener than at any 

 time before, though when its few days of feeding in the mine have 

 passed, and it has again laid up, it is of a deep pinkish flesh-colour. 



After the third moult its colour at first is quite dark slaty-green, 

 matching very well that of the leaves of its food plant ; between the 

 rows of tubercles down the back can be discerned a thin dingy purplish- 

 brown dorsal line spreading a little at each segmental division ; the 

 tubercles are covered with short radiating bristles of a drab colour ; 

 but when it is again laid up it is very much lighter and the glistening 

 skin is of an ochreous-green. 



After its fourth moult, and it has fed a few days, when seen with 

 the two front segments fully stretched out, it is 3|mm. in length, but 

 later when fixed for hibernation with the two front segments retracted, 

 it appears not longer than 3mm., its figure a broad oval, like that of a 

 small hemp-seed, and it is covered with closely-set bristly tubercles and 

 a few longer fine hairs ; three rows of tubercles are on either side of 

 the body in a longitudinal direction, so that six tubercles of broad oval 

 shape surround each segment except on the belly, which is naked ; 

 between the two which occupy the back of a segment is a black arrow- 

 head mark ; these dorsal tubercles are very dark dingy brownish-green 

 with yellowish-green outer edges along the subdorsal region, relieved 

 by a fine blackish line beneath ; the dusky bristles make the general 

 colouring intensely dark on the upper surface, the smooth belly and 

 legs being of greenish-drab colour. 



After hibernation, just at first, the larva appears almost black, but 



