128 SCHOOL ENTOMOLOGY 



of all insects from the standpoint of the timber industry. 

 Some members of the bark-beetle family have other habits, 

 as one which lives on the roots of clover. 



TABLE FOR THE IDENTIFICATION OF THE MORE COMMON 

 FAMILIES OF BEETLES 



COLEOPTERA 



A. Heads prolonged into distinct snouts bearing the mouth- 

 parts on the tips. .Snout Beetles. Rhynchophora. 

 AA. Heads not prolonged into snouts. 



B. Aquatic beetles, legs fitted for swimming. 



C. Palpi longer than the antennae; a keel-like structure 



frequently found on under side. Hydrophilidos. 

 CC. Palpi not longer than the antennae. 



D. Eyes divided into two parts. Gyrinidas. 

 DD. Eyes not divided. Dytiscidce. 

 BB. Not aquatic in habit. 



C. Found mostly on the ground, concealed under rub- 

 bish or running in the open. 

 D. Legs slender, antennae thread-like. 



E. Front vertical, mandibles pointing down- 

 ward. Cicindelidce. 

 EE. Front horizontal, mandibles pointing forward. 



Carabidce. 



DD. Legs usually shorter and stouter, antennae not 

 thread-like. 



E. Scavenger beetles, found about decaying ani- 

 mal or vegetable matter. 

 F. Bodies slender, wing-covers very short. 



Staphylinidce. 



FF. Bodies stouter, wing-covers medium to 

 long. 



G. Antennae gradually enlarged into a 

 club or with sharply rounded, compact 

 knob. SilphidcB. 



