THE STUDY OF INSECTS. 



PLATE III. 



a jtwirT.es 



A COCKROACH (Periplaneta oriental's). 

 (From Rolleston). 



a, antennae; ii, 62, 63, tibiae; f, anal cerci ; d, ganglion on recurrent nerve upon the 

 crop ; e, salivary duct ; _/", salivary bladder; g, gizzard ; h, hepatic coeca; t, chylific 

 stomach ; j, Malpighian vessels; k, small intestine; /, large intestine; m, rectum; 

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



