YPS1PETES IMPLUVIATA. 67 



after the manner of the Gymatojphorse) , or else by curl- 

 ing one side of a leaf over the other. 



The usual position in repose is a curve, the head 

 being turned sideways round to the middle of the 

 body; but when a larva is exposed by being ejected 

 from its dwelling, it loops with activity, pausing 

 occasionally, and stretching its head in all directions 

 in a most impatient manner, as if in search of another 

 retreat. It is only when so stretched out that its 

 actual length can be momentarily observed. 



When full-grown, it is then seen to be about seven- 

 eighths of an inch in length, and rather thick in pro- 

 portion, the body very slightly depressed, of about 

 equal bulk throughout, for it tapers but a very little 

 just at each extremity. 



In some the ground colour of the back is pale 

 purplish-grey, or brownish-grey, with the belly of the 

 same; the head is brown, freckled with still darker 

 brown ; the back of the second segment is black, with 

 the dorsal line running through it as a pale greyish 

 line, but on all the other segments it is wider, black 

 in colour, and thickest about the middle of each seg- 

 ment, suggestive there of an elongated diamond on 

 some of them. The rather thick subdorsal line is of 

 the pale ground colour, begins on the second segment, 

 and is equally well defined throughout its entire 

 length, by reason of the back above being freckled 

 and suffused more or less with dark purplish-brown, 

 especially around the thickest part of the dorsal line, 

 where, on each side of it, an indistinct dark wedge is 

 thus formed with its base on the dorsal line, and its 

 point directed outwards and forwards; besides the 

 general clouding and darkening of the back, there is 

 also a series of black wedge shapes that tend to define 

 the upper edge of the pale subdorsal line much more 

 clearly ; these are placed at the beginning and end of 

 each segment, the anterior one pointing backwards, 

 and the posterior one forwards, while on the thoracic 

 segments they become united and linear. 



