1 INSECTS. 



stance, viz. the stem seeming to pass through the 

 leaves. This kind of Antenna is exemplified in 

 some of the shell-winged or Beetle tribe. 



Another part peculiar to Insects consists in a 

 pair or two of short, jointed processes proceeding 

 from the mouth : they are termed Palpi or Feelers, 

 and are very conspicuous in some insects, and 

 much less so in others. 



The Mouth in insects is generally situated at 

 the lower part of the front, and varies much in 

 structure in the different orders. In the Beetle 

 tribe it is furnished with very strong jaws, often 

 notched or serrated on the inner side into the ap- 

 pearance of teeth: this is also the case in Locusts 

 and many other insects. In some the mouth 

 consists of a tube or instrument for suction, either 

 simple, or variously sheathed and guarded by dif- 

 ferent kinds of appendages. In such insects as have 

 jaws, it is observable that they do not meet per- 

 pendicularly, as in quadrupeds and birds, but 

 horizontally. 



So great is the variety in the structure of the 

 mouth in the different tribes of Insects, that a 

 celebrated Entomologist (Fabricius,) has formed 

 his System from this part in preference to any 

 other. It must be observed however, that this 

 mode of arranging . insects is attended with much 

 difficulty, and seems far inferior to the obvious 

 and easy characters which distinguish the Linnasan 

 distribution. 



The Eyes in Insects are commonly situated on 

 each side the head, and are two in number j but 



