140 



A COURSE ON ZOOLOGY. 



and sharp, capable of tearing and crushing; then a pair 

 of jaws formed by hairy joints. Each jaw has a palp 

 composed of three joints, and called the maxillary palp. 

 'These two pair of processes are covered above by a 

 plate that prolongs the head in front, and is known as 

 the labrum. Underneath the labrum, and consequently 

 below the processes just described, is another plate called 

 the lower lip, or labium, which carries a pair of palps 

 known as the labial palps. 



FIG. 75. 



HEAD OF MAY-BUG (the middle figure is the whole head seen from below, 

 while around it are the separate pieces making up the mouth). L, la- 

 brum; M, mandibles; m, jaw, with the maxillary palp m' ; I, lower lip, 

 with the labial palp I'. 



This organization of the mouth is found with very 

 slight differences in all masticating insects ; in others, 



