THE FLAT BARK BEETLES. 



563 



Fig. 211. (After Chit- 



1072 (3302). Silvanus imbellis Lee, Proc. Phil. Acad. Nat. ScL, 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. 



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 species have been taken in the State, 

 while two others may occur. 



KEY TO INDIANA SPECIES OE CATHAKTUS. 



a. Thorax either subquadrate or longer than wide, its 

 sides nearly straight; body very feebly punctate. 



(Fig. 211.) QUADRICOLLIS. 



aa. Thorax broader than long. 



b. Front angles of thorax each with a distinct tooth. 



c. Second and third joints of antennae subequal ; tendon, Far. Bull. No. 45.) 

 head and thorax minutely and densely punctate; form broader 

 and more convex. 1073. advena. 



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

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



1074. LON GULES. 



bb. Front angles of thorax not toothed. rectus. 

 C. quadricollis Grier., elongate, slender, pale reddish-brown, 

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



1073 (3305). Cathaetus advena Waltl., Si lb. 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 1.7-2 mm. (Fig. 

 212.) 



Southern half of State ; frequent. Janu- 

 ary 24-November 12. 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 clean, dry, well-ven- 

 tilated place the damage will not be serious. 



/ Mm 



Fig. 212. 



X 20. 



.0- 

 (After Forbes.) 



