340 ORDERS OF PTILOTA. 



lobe, which occasionally assumes the appearance of an addi- 

 tional palpus ; and lastly a lower lip (labium, e), furnished 

 with a pair of palpi (ff), and implanted upon a broad horny 

 basal piece, which is termed the chin or mentum (3). 



The abdomen is attached to the mesothorax by its entire 

 breadth, its inferior portion, or the belly, being always more 

 solid in its consistence than the upper surface, owing to the 

 latter being defended by the wing-covers : it is moreover 

 provided, on the under side, with only six segments, whilst 

 on the upper seven or eight are visible. In some insects, 

 however, as the rove beetles (Brachelytra), which have the 

 abdomen, for the most part, exposed, the upper surface is as 

 firm as the lower. The additional segments of the body, two 

 or three in number, which are to be observed in the body of 



r(Crto*iaat,ratn). 



the larva, compose, in the perfect beetle, the organs of 

 generation. 



