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ECONOMIC ENTOMOLOGY 



Chief Families of lite Carnivora Group: 



A. Legs adapted for running; terrestrial; antennae ii-jointed. 



B. Antennae inserted on front of head above the base of the mandibles. — 

 Cicindelidce (Tiger Beetles), p. 284. 

 BB. Antennas inserted on sides of head between the base of the mandibles 

 and the eyes. — Carabida (Ground Beetles), p. 285. 

 AA. Legs adapted for swimming; aquatic. 



B. With only two eyes. — Dytiscidce (Diving Beetles). 

 BB. With four eyes. — Gyrinida (Whirligig Beetles). 



Pig. 182. — Tarsi of coleoptera. A, Leptinotarsa; B, Coccinella; C, Tenebrio, 

 fore leg; D, Tenebrio, hind leg. 



Chief Families of the Clavicornia Group: 



A. Legs fitted for swimming; aquatic. — Hydrophilida (Water-scavengers). 

 AA. Legs not fitted for swimming; terrestrial. 



B. Elytra short. — Staphylinidce (Rove Beetles). 

 BB. Elytra as long or nearly as long as body. 



C. Abdomen with 5 ventral segments. — Dermestidce (Larder Beetles), 

 p. 291. 

 CC. Abdomen with 6 or more ventral segments. — SilphidcB (Carrion 

 Beetles), p. 293. 



