70 



THE STUDY OF INSECTS, 



PLATE III. 



A Cockroach {Peripianeta orzentalis). 



(From Rolleston). 



a, antennse; 3i, ^2, ^3, tibiae; c, anal cerci ; d, ganglion on recurrent nerve upon the 

 crop • e, salivary duct ; /, salivary bladder; ^, gizzard ; h, hepatic coeca; ?, chylihc 

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

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



