364 PESTS^ OF THE HOUSEHOLD AND STORED PRODUCTS 



Fig. 580. — The Saw-Toothed 

 Grain Beetle. Enlarged and 

 natural size. Original. 



Beetles and Weevils in Stored Products 



Stored grain and other stored products are subject to infestation 

 by many species of small beetles. In most cases the greater part of the 

 injury is due to the feeding of '' grubs," which are the immature stages 



of the pest concerned, but since the 

 grubs often work concealed, while the 

 adults are active and visible, the latter 

 are the stages commonly noted. Some 

 of the species most likely to be observed 

 are the following: 



The Granary Weevil (Calandra gra- 

 naria Linn.). A brown snout-beetle, one 

 seventh of an inch long. Infests stored 

 grains, especially wheat, corn, and bar- 

 ley. The wings are not functional, and the insect cannot fly. 



The Rice Weevil {Calandra oryza Linn.). A dark brown snout-beetle 

 with two obscure, slightly lighter markings on each wing cover. 

 Attacks stored grains ; also such 

 manufactured products as crackers, 

 flour, and the like. The adult can 



fly. 



The Confused Flour Beetle (Tri- 

 holium conjusum Duv.). A flat, brown 

 beetle, one sixth of an inch long. 

 A destructive pest of flour, cereal 

 foods, and grains. 



The Rust-red Flour Beetle {Tri- 

 holium navale Fab . ) . Closely resembles 

 the preceding species. The same feeding habits. 



The Saw-toothed Grain Beetle (Silvanus surinamensis Linn.). A 

 slender, dark brown beetle, its thorax edged with short teeth. Found 

 in all kinds of foodstuffs. 



The Cadelle ( Tenebroides maiiritanicus Linn.) . A black, oblong beetle, 

 one third of an inch in length. The larva whitish, fleshy, tapering 



Fig. 581. — The Cadelle. En- 

 larged and natural size. Orig- 

 inal. 



