THE FLAT BARK BEETLES. 



563 



Fig. 211. ( After Chit- 



1072 (3302). SILVANUS 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 dam}) localities, often beneath the bark of sycamore. 



II. CATT-IAHTUS Reiche. 1854. (Gr.. "to cleanse.") 



Small brown forms very close to tfili'fonis but 

 having the middle club joint larger than either of 

 the others; thorax broader than long except in quad- 

 rieolUs. Two species have been taken in the State, 

 while two others may occur. 



KEY TO INDIANA SPECIES OF CATHARTUS. 



(i. Thorax either subquadrate or longer than wide, its 

 sides nearly straight; body very feebly punctate. 

 (Fig. 211.) QUADRK OLI.IS. 



<HI. Thorax broader than long. 



1>. Front angles of thorax each with a distinct to:ith. 



c. Second and third joints of antenna snbequal : 'enden. Far. Bull. No.45.) 



head and thorax minutely and densely punctate; form broader 



and more convc::. 1073. ADVENA. 



cc. Second joint of antenna' distinctly longer and stouter than third; 



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



1074. LONGULVS. 

 l>b. Front angles of thorax not toothed. RECTUS. 



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

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



1073 (3305). CATHARTI-S ADVENA Waltl.. Silb. Rev. Ent, II, 256. 



Oblong, subconvex. Rather pale chestnut 

 brown, 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 2mm. (Fig. 

 212.) 



Southern half of Slate ; I'lvqiient. .Janu- 

 ary L'4-November 1:2. Probably occurs 

 throughout the State, as it feeds on various 

 articles of commerce, especially damp flour, 

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

 articles be stored in a clea.n. dry, well-ven- 

 ie. 212. x 20. (After Forbes.) tilatcd place the damage will not be serious. 



