and. Classification of Rhynchota. 231 
first kill and then suck, and consequently must often repeat 
the thrust. In this latter case the whole figure must 
slimmer, the head smaller and susceptible of lateral and rota- 
tory movements, whilst the shape of the 
for the rest may vary very considerably according to the 
nature of the prey. But in the former case the general figure 
tive force if it is directed out from the body of the animal; 
the requisite force is obtained only when the thrust is directed 
The lived and flat form of the head of the Cicada, which is 
not capable of turning, is imitated by the head of bugs, which 
are not exclusively blood-suckers, although their head is always 
capable of turning. The imitation consists in this, that the 
