106 GRAMMAR OF ENTOMOLOGY. 



CHAPTER III. 



OF THE ORGANS OF SUPPORT IN THE HEAD. 



357. THE head of insects, like the following 

 segments, is composed of four smaller portions ; in 

 this instance, however, not merely distinguished by 

 sutural lines, but perfectly separated, and freely 

 articulated : these are the skull (cranium), the 

 upper and lower lips (labrum, labium\ the feeler- 

 jaws (maxillce), and the jaws or mandibles (mandi- 

 bulte) : the lips, feeler-jaws, and jaws, constitute 

 the mouth of an insect. 



358. Each section of the head has a tendency 

 to produce two feelers : on the last, the man- 

 dibles, they are obsolete ; on the skull, lips, and 

 feeler-jaws, they are very distinct : in the lobster, 

 and other animals resembling it, which are closely 

 related to insects, the mandibles are furnished 

 with distinct feelers. 



359. The skull consists of four portions ; the 

 superior surface or crown (e<picranmm\ the inferior 



