XX 
THE parts of an Infe& chiefly to he diftinguifh- 
ed are thefe four: Head, Trunk, Abdomen, and 
Limbs, The head, thorax, and abdomen are diftinft- 
in moft infefts, but in the crab, and fpider,.the head 
t 0 
and thorax eoalefce. 
The mouth confifts of the clypeus, (i. e. its upper 
cover.) of the lips, the mandibles, the maxillae, the 
galea (i.e. the covering of the back of the maxillae,) 
the palpi,-the fpiral tongue, the prooofcis, the loilruro, 
and the hauftellum. N.B. All thefe parts are not 
found in the fame infeft. The lips clofe the under- 
moft part of the mouth. The two mandibles, in- 
clofe the fldes of the mouth above ; and the maxillsa 
inclofe them beneath. 
, i.e ^ 
The Palpi are two, four, or fix. 
Th t Spiral Tongue is found in the Lepidoptera clafs. 
The Rojlrum is a jointed ftieath of one valve, con¬ 
taining fetas or briftles, generally three : this is found 
in many genera of the clafs Hemiptera. 
ThC 
