114 



THE COCKROACH : 



times the length of the body in Hydrophilus. Parts of the 

 canal are specialised for different digestive offices, and their 

 order and relative size are given in tho following: table : 



(Esophagus and crop 



Grizzard 



Chylific stomach 



Small intestine 



Colon 



Rectum 



95 in. 

 1 



5 



1 



875 

 25 



775 



Fig. 56. Alimentary Canal of Cockroach. X 2. 



The principal appendages of the alimentary canal are the 

 salivary glands, the caeca! diverticula of the stomach, and the 

 Malpighian tubules. 



