562 FAMILY XXI. — GUCVJWJE. 



KEY TO INDIANA SPECIES OF SILVANrS. 



a. Thorax suboval, its sides each with six teeth. 1069. subinamensis. 



aa. 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. 



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



without a tooth behind the eye. 1072. imbeeus. 



*1069 (3299). Silvands sukinamensis L., Syst. Nat., II, 1767, 565. . 

 ^^ j(^ Elongate, depressed. Dark chestnut brown clothed 



^<(,j^a^(^ with lighter pubescence. Antennae slightly longer than 

 \ 7r Y / thorax. Thorax longer than wide, the disk with three 

 ' raised- lines; sides evenly curved and jirovided with six 



distinct teeth. Elyti'a each with four costee, the inter- 

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



IMarion 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 receptable air- 

 te^dm^^'ra/^'Su^s" *^stt, or as nearly so as possible, and pouring in 

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



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

 larv* will be killed without leaving anj- odor or flavor behind. Hi- 

 bernates as imago. April 25-December 2s. 



1070 (3300). Silvakl-s 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 suriii<iincnsis. Length 

 2.7 mm. 



]\larion, Putnam. Jackson. Lawrence and Crawford counties; 

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



1071 (3301). SiLVAxrs plaxatus Germ., Ins. Spec. Nov., 1S24, KiU. 

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



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

 thence distinctly converging. Len^lli 2.2-2.7 mm. 



Throughout the Stale: common. Ainil l(5-Xovcmber 30. It is 

 possible that this is tlic female of bidrnlnlna. They often occur in 

 company and Linell stated ( Entom. Amer. Ill, ]71), that he had 

 taken the two in coitu. 



