K YM E NOP TERA, 
A 2 
The gall infedh penetrates the bark or fpot which 
begins to bud, and* there fheds a drop of corrohve 
hind, lays its egg and dies ; the heart of the bud 
being thus wounded, the circulation of the nutri¬ 
tive juices is interrupted, and the fermentation 
thereof, with the poifon inje£ted by the fly, burns 
the adjacent parts, and alters the natural colour of the 
plant; the juice or fap turned back from its natural 
courfe, gives rife to what we call the gall-nut. 
GENUS 2.—TENTHREDO, SAW-FLY. 
Numerous are the fpecies of the tenthredines; they 
are not very fhy. Some, by mean of their faw, 
depoflt in the buds of flowers, others on the twigs of 
trees or fhrubs, eggs, from which are produced falfe 
caterpillars. The implement with which they are 
armed is not very formidable, as it appears deftined 
only to the purpofe of depofiting their eggs. 
Falsi caterpillars are diflinguiflied by the number 
of feet, being generally from eighteen to twenty-two ; 
thofe of the true never exceed fixteen, and are fel- 
dom 10 numerous. 
The larvae of the tenthredines feed chiefly upon 
the rofe and willow tree, and undergo their laid 
changement in the earth ; their fhroud or web re- 
fembles net-work, being compofed of large filken 
threads, between each of which great fpaces are left, 
perhaps, to let the humidity of the earth pierce to 
the chryfalis : it is very difficult to keep them in a 
proper 
