THE DARKLING BEETLES. 1249 



KEY TO INDIANA SPECIES OF XYLOPINUS. 



(/. Body black, not metallic. 



1>. Legs black. 2307. SAPERDIOIDES. 



6b. Legs reddish-brown. HI FIPES. 



aa. Body brown with a brassy tinge. --"-OS. /ENESCK.NS. 



2307 (7413). XYLOIMNI-S SAPERDIOIDES Oliv., Ent., III. 1795, 11. 

 Elongate, subparallel, convex. Black, feebly shining; antenna? and 



tarsi piceous. 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 12-10 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 sapcrdioidrs and is probably only a variety of that species. 



2308 (7415). XYLOPINUS ^NESCENS Lee., New Sp. N. Am. Col., 1866, 120. 

 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 impression each side in front of base. Ely- 

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

 impressed and less strongly punctured. Tooth of front tibia? of male much 

 less prominent. Length 13-15 mm. 



Marion County; rare. May 24. Occurs in the "Middle and 

 Western States." 



VI. TENEBRIO Linn. 1758. (Gr., "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 ; antennas 

 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 TENEBRIO. 



(/. Tiv.chantin of middle coxa 1 very distinct; form elongate, narrowly oval 



or parallel. 



!>. Surface dull, opaque; length 14-17 mm. 230!). ORSd'Rrs. 



lib. Surface more or less shining. 



c. Thorax broader than long; length 13-10 mm. 2:510. .MOI.ITOR. 



cc. Thorax nearly square; length 0-10 mm. 2311. CASTANEUS. 



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



12-13 mm. 2312. TENEBRIOIDES. 



