70 



THE STUDY OF INSECTS. 

 PLATE III. 



ilCWITT.Sfl 



t^ 



A Cockroach (Periplaneta orientalis). 

 (From Rolleston). 



a, antennae; bi, bo., b$, tibiae; c, anal cerci ; d, ganglion on recurrent nerve upon the 

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

 stomach ; y\ Malpighian vessels ; k, small intestine ; /, large intestine ; »z, rectum ; 

 «, first abdominal ganglion ; o, ovary ; p, sebaceous glands. 



