562 



FAMILY XXI. — CUCUJID.E. 



KEY TO INDIANA SPECIES OF SILVANUS. 



a. Thorax suboval, its sides each with six teeth. 10G9. sukinamensis. 

 a a . Thorax elongate, the sides not toothed. 



6. Thorax strongly narrowed behind, the sides more or less sinuate; 

 head with a small tooth behind each eye. 

 c. Thorax with a sharp divergent tooth at each front angle; elytra 

 very opaque, strongly punctured. 1070. bidentatus. 



cc. Thorax with teeth less developed ; elytra somewhat shining, less 

 densely punctured. 1071. planatus. 



1>1). Thorax very feebly narrowed behind, the sides nearly straight ; head 

 without a tooth behind the eye. 1072. imbellis. 



*1069 (3299). Silvaxus sukixamensis L., Syst. Nat.. II, 1767, 565. 



Elongate, depressed. Dark chestnut brown clothed 

 with lighter pubescence. Antenme slightly longer than 

 thorax. Thorax longer than wide, the disk with three 

 raised lines; sides evenly curved and provided with six 

 distinct teeth. Elytra each with four costae, the inter- 

 vals granulate-punctate. Length 2.5 mm. (Fig. 210.) 



Marion and Vigo counties ; common. Probably 

 throughout the State, as it has been carried by com- 

 merce all over the globe. On account of damage 

 done to stored grain, corn in particular, it is known 

 as the "corn silvanus. " It also feeds on dried 

 fruits. By closing the bin or fruit reeeptable air- 

 Fig. 210. (After chit- tight, or as nearrv so as possible, and pouring in 



tenden. Far. Bull. 4o, ° . 



u. s. Dep. Agr.) bisulphide of carbon, a gill for each bushel capacity, 



and allowing it to evaporate for twenty-four hours, both beetles and 

 larva? will be killed without leaving any odor or flavor behind. Hi- 

 bernates as imago. April 25-December 28. 



1070 (3300). Silvanus bidextatus Fab., Syst. El.. I, 1801, 317. 

 Elongate, subdepressed. Dark reddish-brown, very opaque, densely 



punctured. Front angles of thorax sharply toothed the disk somewbat 

 convex and with traces of the raised lines seen in surinamensis. Length 

 2.7 mm. 



Marion. Putnam. Jackson, Lawrence and Crawford counties: 

 frequent. March 20-June 12. Taken beneath bark and by sifting. 



1071 (3301). Silvanus flaxatus Germ., Ins. Spec. Nov., 1S24, 466. 

 Elongate, depressed. Dark chestnut brown, less densely punctured. 



Thorax broader than in Mdentatus; sides parallel from apex to middle, 

 thence distinctly converging. Length 2.2-2.7 mm. 



Throughout the State ; common, April 16-November 30, It is 

 possible that this is the female of bidentatus. They often occur in 

 company and Liaell stated (Entom. Amer. III. 171). that he had 

 taken the two in coitu. 



