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 
Fig. 268 — Sexton Beetles {Necruphorm vespillo), with larva and nymph. They are 
burying a mouse, preparatory to laying their eggs in it., 
are the savage but beautiful Tiger Beetles ( Cicindela ); 
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 (< Silphci ), distinguished by their black, flat 
