A P T E R A • 
Termes Pulfatorium . 
• % 
Lei's than a common loufe. 
* \ 
It runs, and even leaps a little when touched. 
This infect has been thought by home to imitate the 
ticking of a watch, by ftriking its head again!! the 
wainfcot; which occafioned Linnaeus to give it this 
name. But this noife is caufed by one of the ptini; 
and is a call to others of the fpecies ; miftakenly, by 
lome fuperllitious perfons, called the death-watch, 
GENUS 4,—PEDICULUS, LOUSE. 
There are various ipecies. 
Few of the pediculi of birds have been obferved m y 
though it is pretty certain that almof! every different 
animal is infeffed with a diRerent fpecies of them. 
The plate is Pediculus humanus Common , Louft . 
y ✓ ’ 
GENUS 5.—PULEX, FLEA. 
The Flea is the only infeft belonging to this order 
that undergoes the fame metamorphofis with thofe of 
the other orders. All the other apterous in lefts 
being produced in their perfeft ftate, either by the 
mother or from the egg. 
i 
The larva has a forked tail; and fpins a covering 
for the pupa j which has feet; of which, however, 
it 
