57 
odour the one in question is covered all over 
with a slimy mutter, and produces an odour w'hich 
I should suppose similar to that mentioned by 
KikbY. Even the few which have infested trees 
coming’ under my notice have, when passing the 
trees, produced this odour, and on approaching 
more closely to the leaves which were infested, the 
effluvia or smell produced was nauseous and 
sickly. The head of the larvae is quite obtuse, 
tapering to a smallish point at the reverse end. 
It is very sluggish and inactive. While in the 
act of feeding, it retains this glutinous appear- 
ance, and is nearly black, but when this is cleared 
off, or when it is about leaving the tree, to un- 
dergo its first change, it assumes a yellowish 
appearance, except the head, which is black. The 
first cletch of young makes its appearance 
about the beginning of July, and feeds about four 
or five weeks upon the leaves of the tree, then it 
descends into the eai’th, and forms to itself a case 
or covering, the inner part of which is composed 
of silken materials, produced from itself, which is 
ingeniously coated over with a little earth. It is 
of a longish round shape, and so much resembles 
small lumps of earth, about the size of a moderate 
pea, that it would easily escape the notice of a 
careless observer. I am led to believe that it 
must only remain in its cell a few weeks, when 
the Sawfly (Tenthrido Cerase) is produced, 
which is the progenitor of another generation 
in the same year, as I have found young ones 
E 
