THE STUDY OF INSECTS. 



PLATE III. 



a JEWITT.M 



A COCKROACH (Periplaneta orientalis). 

 (From Rolleston). 



antennae; b\, 62, 63, tibiae; c, anal cerci ; </, ganglion on recurrent nerve upon the 

 crop ; e, salivary duct ; _/", salivary bladder; g, gizzard ; /i, hepatic cosca; , chylific 

 stomach; j, Malpighian vessels ; A, small intestine ; /, large intestine ; , rectum ; 

 n, first abdominal ganglion ; o, ovary ; /, sebaceous glands. 



