ARTHROPODA 



117 



beetles (Cicindela)\ the common ground beetles (Har- 

 palus\ whose elytra bear parallel ridges; the diving 

 beetles (Dytiscus), with boat-shaped body, and hind 

 legs changed into oars; the carrion beetles (Silpha\ 



FIG. 77. Sexton Beetles (Necrophorus vespillo), with larva and nymph. They are 

 burying a mouse, preparatory to laying their eggs in it. 



distinguished by their black, flat bodies and club-shaped 

 antennae ; the goliath beetles (Goliatkus), the giants of 

 the order ; the click beetles (Alans) ; the lightning 

 bugs (Pyrophorus); the spotted lady-birds (Coccinella); 

 the showy, long-horned beetles (Cerambycidce}\ and 



