THE BEETLES 



165 



The darkling beetles (Tenebrionidae) live mostly under bark and 

 stones, are dull black, and have much the same general appearance 

 as the ground beetles. They are much more abundant on the 



FIG. 243. The meal-worm ( Tenebrio molitor) 



a, larva ; Z>, pupa ; c, female beetle ; d, egg with surrounding case ; e, antenna. (All except e 

 about twice natural size ; e, greatly enlarged.) (After Chittenden, United States Department 



of Agriculture) 



Pacific coast and in the Rockies, relatively few forms being found 

 in the East. A common species of the typical genus is the meal- 

 worm beetle (Tenebrio molitor) which infests grain-rooms, stores, 



e f 3 



FIG. 244. The striped blister-beetle 



a, female beetle ; l>, eggs ; c, triungulin larva ; d, second or carabid stage of larva ; e , same 



as / doubled up as in pod ; /, scarabaeoid stage ; g, coarctate larva. (All except e enlarged.) 



(After Riley and Chittenden, United States Department of Agriculture) 



