374 COLEOPTERA OF NORTH AMERICA, 



The genera inhabiting our fauna are distinguished as follows: — 



Outer joints of antennae broader ; 

 Anterior tarsi normal ; 



Epipleurje broader at base, attaining the humeral angle. iEleodes. 

 Epijileurse. very narrow, not attaining the humeral angle. 



Embaphion. 



Anterior tarsi witli tlie first joint sliort, prolonged beneatii in an angle ; 



elytra costate. Trogloderus. 



Outer joints of antennse not broader, 8-10 moniliform, suddenly shorter 



tlian'the j^recediug joint. Blaps. 



The characters used by Lacordaire (Genera Y. 141) drawn 

 from the structure of tlie nientuni, fail entirely in our series of 

 Eleodes. While it is distinctly trilobed in some, the mentun 

 gradually loses the lateral lobes, first by inflexion, then by dis- 

 appearance entirely, so that the form observed in Blaps is repro- 

 duced. Discogeivia and Promus have been united with Eleodes. 

 The latter genus is distributed over the entire region west of the 

 Platte River extending as far north as Hudson's Bay, and south 

 to Mexico. Embaphion with few species occurs in Texas, Kan- 

 sas, and Arizona. One (possibly two) species of Blaps {B. 

 moiiimga Linn.) has been introduced, and is found abundantly 

 at Alexandria, Va. Trogloderus with one species ( T. costatus 

 Lee.) occurs in Nevada; it seems to lead toward the Scaurini. 

 It may be known by its strongly costate elytra, and the two deep 

 irregular fovcie on the thorax. 



Tribe II.— SCAL'RSIVI. 



Body elongate, apterous ; head prolonged behind the eyes, 

 which are small, transverse, reniforra, and coarsely granulated ; 

 front dilated at the sides and anteriorly; labrum covered; mentnm 

 small, with small inflexed lateral lobes; ligula prominent; gular 

 peduncle distinct; palpi with the last joint dilated, triangular; 

 antennoB 11-jointed, outer joints broader, rounded, subtransverse. 

 Elytra not embracing widely the flanks of the abdomen; epi- 

 pleuras narrow, reaching the tip of the elytra; mesosternum very 

 short, side pieces narrow; epimera distinct. Hind margin of 

 third and fourth ventral segments subcoriaceous ; third and 

 fourth ventral sutures deeply impressed, the corresponding seg- 

 ments scarcely emargiuate in Eulabis. deeply emarginate in the 

 other genera. Anterior coxa3 rounded; middle coxte with dis- 



