22 
HEM IP TER A, 
elytra and wings: they run and leap upon plants 
and flowers with great agility. 
They are divided into five families. 
The larvae of one fet (ranatrceJ difcharge from 
their bodies a kind of froth* under which they con¬ 
ceal themfelves from the rapacity of fuch ftronger 
infefls as prey upon them, and from the fcorching 
heat. Another fet (manifercej pafs a year under 
ground : thefe make a noife like crickets. 
GENUS 6.—NOTONECTA. BOAT-FLY. 
This infefl is not uncommon in {landing waters r 
when it fwims on its back, the hinder feet, longer 
than the reft, ferving it as paddles ; it is very nim¬ 
ble, and dives when you go to take hold of it, after 
which it rifes again to the furface. It muft be cau- 
tioufly handled, for the point of its roftrum is very 
« 
The larva very much refembles the perfefl infefl*. 
GENUS 7 .—NEPA. WATER-SCORPION. 
We have but three fpecies of this genus ; all found 
in the water, as well as their larvae and chryfalids. 
The infefl finks its eggs into the ftalk of a bull- 
rufti, or fome other water-plant, fo that the egg lies 
concealed, and only the hairs or briftles at the end 
flick out* One may perceive in water thefe ftalks 
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