326 



ECONOMIC ENTOMOLOGY 



covers variable in color — purple, green or coppery. Often destruc- 

 tive in the West to leguminous crops. June-August. 

 Control. — Spray with arsenical solution. 



CUCUJID^ 



Saw-toothed Grain-beetle {Silvanus surinamensis Linn.). — A 

 widely distributed beetle, feeding on stored grain and their products, 

 and on starchy goods (Fig. 211). 



Adult.— h. minute flattened chocolate-brown beetle; margins 

 of thorax with six tooth-like projections; ifo inch long; two grooves 

 in thorax; head and thorax finely punctate; wing-covers punctured 

 and lined. There may be four generations in a season. 



Larvce. — Flattened, with transverse, rectangular, yellowish, 

 chitinized spots above; 6 legs; active. 



Pig. 211. — The saw-toothed grain-beetle {Silvanus surinamensis): a, adult; b, 

 pupa; c, larva — all enlarged; d, antenna of beetle. (After Chittenden.) 



Pupa. — White, occasionally enclosed in a delicate cocoon made 

 of particles of food. 



OSTOMATIDvE = TROGOSITID.^: 



The Cadelle (Tenebroides mauritanica Linn.). — Feeds on stored 

 grain and also on other injurious grain insects. 



Adult. — An elongate oblong depressed beetle, nearly black; 

 elytra longitudinally ridged; head and thorax finely punctate; }^ inch 

 long; found in granaries. 



