By William Spence, Esq. 



29 



transverse line : and on each of the remaining segments, that 

 is from the fourth to the eleventh inclusive, are six, one on 

 each side and four in the middle, forming a square, of which 

 the two anterior are larger and nearer to each other than the 

 two posterior. It is to be observed that this description ap- 

 plies only to the back' of the larva, as both the belly and 

 sides have other similar mamillae, which it is unnecessary to 

 particularize. The period in which these insects exist in 

 the larva state, is, as far as my observations extend, about a 

 year; during the whole of which, except in winter, when 

 they probably lie torpid, they are employed in boring into 

 the bark and alburnum. As the female moth seems to de- 

 posit her eggs through the whole summer, the larvae may be 

 always met with, and of very different sizes. 



Chrysalis. The larvae which are then full grown, and these 

 are the greater number, assume the state of chrysalis about 

 the latter end of May, soon after which time many of the 

 empty husks, from which the moths have escaped, may be 

 seen projecting from the bark : and from this period, to the 

 end of summer, others, lying still undisclosed within their 

 silk-lined cavities, are found on cutting into the wood. The 

 chrysalis has the usual sub-conical shape of those of the 

 tribe of Tortrices. It is about one third of an inch long, and 

 a line broad in the widest part ; of a pale yellow colour when 

 first disengaged from the larva, but nearly brown when 

 mature; and smooth, except that each abdominal segment 

 is set with two transverse lines of aculei, or little teeth, 

 pointing towards the tail, of which those in the line nearest 

 the head are larger and fewer in number than those in the 

 line next the tail. These aculei, which are found in the 



