THE DARKLING BEETLES. 



KEY TO INDIANA SPECIES OF XYLOPINUS. 



1249 



a. Body black, not metallic. 



6. Legs black. 2307. sapebdioides. 



66. Legs reddish-brown. bufipes. 



aa. Body brown with a brassy tinge. 2308. .enescexs. 



2S07 (7413). Xylopixus sapebdioides Oliv., Ent., Ill, 1795, 11. 



Elongate, subparallel, convex. Black, feeblj- shining; antennje and 

 tarsi plceous. Thorax nearly square, slightly narrowed in front, sides fee- 

 bly curved; front angles rounded, hind ones acute; surface densely and 

 rather coarsely punctate, with an impression each side near the base. Ely- 

 tra elongate, parallel: striae coarsely and closely punctured; intervals mod- 

 erately convex, sparsely and finely punctured. Length 12-16 mm. 



Throughout the State; frequent. June 16- August 26. Occurs 

 especially beneath the bark of oak. 



X. rufipes Say, length 11-16 mm., is said to have the same range 

 as sapcrdioidfs and is probably only a variety of that species. 



I'SOS (741.5). Xylopixus .-exescexs Lee, New Sp. N. .im. Col., 1866, 12U. 



Elongate-oval. Brownish or piceous, bronzed, shining. Thorax one- 

 third broader than long, sides broadly rounded; surface finely and rather 

 sparsely punctate and with an imijression each side in front of base. Ely- 

 tra more dilated behind the middle than in the preceding, their strise less 

 impressed and less strongly punctured. Tooth of front tibise of male much 

 less prominent. Length 13-15 mm. 



]\larion County; rare. ^lay 24. Occurs in the "Middle and 

 "Western States." 



VI. Tenebrio Linn. 17.58. (Grr., "darkness.") 



^Medium-sized black or brownish, elongate-oval or parallel, feebly 

 convex forms having the tarsi clothed with a coarser, less dense and 

 more rigid pubescence than in the preceding genera; antennae 

 gradually thicker toward the tip ; palpi and tarsi short. Four spe- 

 cies are known from the United States, all of which occur in In- 

 diana. 



key to species of tenebeio. 



a. Trcchantiu of middle coxie very distinct ; form elongate, narrowly oval 

 or parallel. 

 It. Surface dull, opaque; length 14-17 mm. . 2309. obscieus. 



6,'j. Surface more or less shining. 



c. Thorax broader than long; leugth 13-16 mm. 2310. molitob. 



(c. Thorax nearly square; length 9-10 mm. 2311. castaneus. 



aa. Trochantin of middle coxa; very small ; form more broadly oval ; length 



12-13 mm. 2312. tenebeioides. 



