7o 



THE STUDY OF INSECTS. 



PLATE III. 



A Cockroach (Perifllaneta orientalis). 



(From Rolleston). 



«, antennae; b\, iz, £3, tibiae; c, anal cerci ; d, ganglion on recurrent nerve upon the 

 crop ; e, salivary duct ; /J salivary bladder; ^, gizzard ; h, hepatic cceca; », chylific 

 stomach ; /, Malpighian vessels; £, small intestine; /, large intestine ; «*, rectum; 

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



