298 
COMPARATIVE ZOOLOGY, 
The mandibles are well developed, and the integument 
generally is hard. 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 high¬ 
est tribes are carnivorous; The most prominent forms 
Fie. 268.—Sexton Beetles {Necrophorus vespillo ), with larva and nymph. They are 
burying a mouse, preparatory to laying their eggs in it ., 
are the savage but beautiful Tiger Beetles (CHdndela); 
the common Ground Beetles (Cardbus), whose hind wings 
are often absent; the Diving Beetles (. Dytiscus ), with 
boat-shaped body, and hind legs changed into oars; the 
Carrion Beetles ( Siljohci ), distinguished by their black, flat 
