286 



ECONOMIC ENTOMOLOGY 



Ground beetles are common insects and, with two or three exceptions, 

 prey upon injurious forms and do not feed upon fruits, leaves or seeds. 

 (See Part I, Beneficial Insects.) Following are the species most com- 

 monly met with: 



Some Common Carabids 



Murky Ground Beetles: 



Pterostichus lucuhlandus Say. — Color usually green or bluish, not 

 polished; length 10-14 mm.; thorax widened posteriorly; striae of elytra 



Fig. 186. — A carabid beetle (Pleroslichus lucuhlandus) . (.After Gibson and Treherne, 

 Ent. Bui. 12, Dep. Ag. Can.) 



smooth; 4 dorsal punctures; legs usually reddish; under surface punc- 

 tured; three basal joints of antennae distinctly carinate; basal impressions 

 of thorax double (Fig. 186). 



Galerita janus Fab. — Black, clothed with short hairs; length 17- 

 22 mm.; legs, palpi, thorax and base of antennae reddish-brown; head 

 black, strongly constricted behind; prothorax half as wide as wing- 

 covers; elytral striae fine not punctured. 



Lebia grandis Hertz. — ^Length 9 mm.; head and thorax reddish-yel- 



