26 
The musk beetle, or goat-chaffer, frequently found in the willow, 
is a Cerambyx. 
The larvae of this genus subsist on the inner part of the bark of 
trees, and in which situation they mostly undergo their transfor- 
mations. 
GENUS XVII. LEPTURA. Tab. 27 and 28. 
Linn. Syst . Mat. page 637. 
The antennae of this genus are setaceous, or taper gradually to 
their points. 
The elytra diminish in breadth towards their extremity. 
The thorax is of a globular and slender make. 
There are two sections or families of the Leptura : 
1. Those whose thorax is something oblong, but broader at its 
base than at the head ; and whose elytra are truncated, or cut of! 
in a direct line at their extremity. 
2. Those with the thorax of a globular form, with their elytra 
obtuse at their extremity. 
Their larvæ are found in similar situations with those of the pre- 
ceding genus : and the insect, both in figure and manners, is nearly 
allied to the Cerambyx. 
GENUS XVIII. NECYDALIS. Tab. 23. 
Linn. Syst. Mat. page 640. 
Their antennæ are setaceous, as in the Lepturæ. The elytra are 
either shorter than the abdomen ; or narrower, and of equal length 
to that part. 
