344 



REVISION" OF THE TENEBRIONID/E OF AMERICA, 



tened on the disc. The elytra are striate, the stria) punctured. The interstices are mod- 

 erately convex and finely punctured. The legs are black and the under surface of the 

 body smooth. 



Length .44-64 inch. 



Common in nearly the entire region east of the Mississippi River, under loose hark. 



X. ruflpes, Say, (Tenebrio) Journ. Acad. V., 20;!. 



Scarcely different from the preceding. The legs are red except the bases of the tibiae. 

 It does not differ in size and sculpture from the preceding, and though common, is less so 

 than mperdoides, and occurs in the same region. 



X. aenesce as, Lee., N. Species, p. 120. 



Differs from the preceding two species, by its broader thorax and by the elytra being 

 more dilated behind the middle. The color is pale brown, with a brassy tinge. The legs 

 are slender, and the tooth of the anterior tibia of the male is less prominent and the emar- 

 gination below it less deep. 



Length .50-57 inch. 



Middle and Western States, not common, though more abundant in the latter region. 



SUB-TRIBE II TENEBRIONES. 



In this group the tarsi arc clothed with a coarser, less dense, and more rigid pubes- 

 cence than in the preceding. The body is always elongate, never robust, usually de- 

 pressed. The mentum is trapezoidal, generally flattened. The tibial spurs are always 

 conspicuous. The epipleurse are variable in length. 



Our genera arc; as follows : 



Antenna- gradually thicker toward the tip, palpi and tarsi short. 



EpipleuriK entire. tenebrio. 



Epipleurw abbreviated. 



Head sub-quadrate ; similar in the sexes. bius. 



Head transverse; dissimilar in the sexes. sitophagus. 



Antennas elongate, slender, last joint fusiform; palpi long; tarsi slender. 

 Epipleurse entire. 



Mentum cmarginatc in front. alterhus. 



Mentum truncate in front. eupsophus. 



The genera of this sub-tribe arc much less homogeneous than (lie CJpes, although 

 fewer in number, and this dissimilarity seems to indicate that, by the division of the Ton- 

 ebrionidsc and their apportionment in tribes by the discovery of better characters than 

 those now known, these genera would not be found associated. The genus Sitophagus 

 has been placed here (as done by Mulsant), the form of the anterior coxa? indicating but 

 little affinity with the genera allied to Uloma. 



