562 



FA M JLY XXL CUCUJID.E. 



KEY TO INDIANA SPECIES OF SILVANUS. 



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

 (iu. Thorax elongate, the sides not toothed. 



1>. 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. 



&&. Thorax very feebly narrowed behind, the sides nearly straight; head 



without a tooth behind the eye. 1072. IMBELLIS. 



*10G9 (3299). SILVANUS SUKINAMENSIS L.. Syst. Nat., II, 1767, 565. 



Elongate, depressed. Dark chestnut brown clothed 

 with lighter pubescence. Antenna? 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 costse, 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 nearly so as possible, and pouring in 



tenden. Far. Bull. 45, 



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 BIDENTATUS Fab., Syst. El., I, 1801, 317. 

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



punctured. Front angles of thorax sharply toothed the disk somewhat 

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

 1'.7 nun. 



Marion, Putnam, Jackson, Lawrence and Crawford counties; 

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



1071 (3301). SILVAN rs PLANATUS (Jorin.. Ins. Spec. Nov., 1824, 466. 

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



Thorax broader than in liitlciitutii* ; sides parallel from apex to middle. 

 thence distinctly converging. Length 2.2-2.7 mm. 



Throughout the S'nle; common. April 16-November 30. It is 

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

 company and Linell stated (Entom. Amer. Ill, 171), that he had 

 taken -the two in 



