THE PIjAT bark BEETLES. 



563 



1072 (3302). SiLVANCs imbellis Lee, Proc. Phil. Acad. Nat. Sci., VII, 

 1854, 77. 

 Elongate, rather narrow, depressed. Dark reddish-brown, subopaque, 

 very deeply and densely punctured. Thorax slightly longer than wide, the 

 teeth of front angles but slightly developed; disk finely and densely punc- 

 tate ; hind angles obtuse. Length 2.5 mm. 



Throughout the State; frequent. February 4-November 8. 

 Occurs in damp localities, often beneath the bark of sycamore. 



Fig. 211. (After Chit- 

 tenden, Far. Bull. No. 46.) 



II. Cathartus Reiche. 1854. (Gr., "to cleanse 



Small brown forms very close to Silvanus but 

 having the middle club joint larger than either of 

 the others ; thorax broader than long except in quad- 

 ricollis. Two s]iecies have been taken in the State, 

 while two others may occur. 



KEY TO INDIANA SPECIES (JF CATHAKTUS. 



u. Thorax either subiiuadrate or longer than wide, its 

 sides nearly straight ; body very feebly punctate. 



(Fig. 211.) QUADKICOLLIS. 



an. Tliorax broader than lon.g. 



7). Front angles of thorax each with a distinct tooth, 

 c. Second and third .joints of antennie subequal ; 



head and thorax minutely and densely punctate; form broader 



and more convex. 1073. advena. 



ISC. Second joint df anteume distinctly longer and stouter than third; 



head and thorax densely granulate-punctate; form more slender. 



1074. LONGULrs. 



l)h. Front angles of thorax not toothed. eectos. 



('. quadricollis Gruer., elongate, slender, pale reddish-brown, 



shining, length 2.4-3 mm., is known from Pennsylvania and Georgia. 



1073 (3305). Cathaetcs advena Waltl., Silb. Rev. Ent, II, 256. 



Oblong, subeonvex. Rather pale chestnut 

 lirown, shining, finely pubescent. Thorax quad- 

 rate, one-third broader than long, sides feebly 

 curved, front angles with minute blunt teeth, 

 hind ones rectangular. Elytra with rows of 

 rather coarse punctures. Length 1.7-2 mm. (Fig. 

 212.) 



Southern half of State ; freijuent. Janu- 

 ary 24-November 12. Probably occurs 

 throughout the State, as it feeds on various 

 articles of commerce. es]i(M3ially damp flour, 

 meal, rice, figs, beans, apples, etc. If these 

 articles be stored in a clean, dry, well-ven- 

 tilated place the damage will not be serious. 



Fig. 212. X 20. (After Forbes.) 



