298 



COMPARATIVE ZOOLOGY. 



The mandibles are well developed, and the integument 

 generally is bard. The legs are strong, for the Beetles 

 are among the most powerful running Insects. The lar- 

 vae are worm-like, and the pupa is motionless. The higli- 

 est tribes are carnivorous. The most prominent forms 



Fie. 268._Sexton Beetles (Necrophortis vetpttlo), with lai'va and uyrnph Thev aie 

 buryiug a mouse, preparatory to laying their eggs in it , 



are the savage but beautiful Tiger Beetles {Cicindela); 

 the common Ground Beetles {Car.ahus), whose hind wings 

 are often absent; the Diving Beetles (Dytiseus), with 

 boat-shaped body, and hind legs changed into oars; the 

 Carrion Beetles (Silpha), distinguished by their black, flat 



