977 



1873.] -' « [Horn. 



fication" of Dr. Leconte. Baaanius has been removed from the first 

 and placed near Ac ret us in the second, the reasons for which will be given 

 in the proper place. Tribalus has the prosternal lobe short, but its lat- 

 eral prolongations form the lower boundary of the antennal fossa, a 

 structure which cannot exist in the second sub-tribe. 



Sub-Tribe Histrixi. 



This sub-tribe contains in our fauna the larger number of genera and 

 species. 



The genera are thus distinguished : 

 Antennal cavities at the anterior angle of the thorax, 

 usually closed beneath more or less entirely by the 

 pectoral plate, but open in front. 

 Antennal club more or less oval, pubescent, and 

 usually, distinctly annulated. 

 31andibles moderately prominent, upper edge round- 

 ed, not clasping the epistoma, labium trape- 

 zoidal. 

 Antennal club broadly oval, distinctly annulated, 



elytra never acutely margined Hester. 



Antennal club elongate oval, apparently solid but 



pubescent, elytra acutely margined Tjubalistei;. 



Mandibles retracted, upper edge acute, at base clasp- 

 ing the epistoma, labium short, very transverse. 

 Prosternum broad, lobe short, elytra scarcely 



striate, form ovate Tribalus. 



Prosternum moderate, lobe moderately prolonged, 



elytra striate, form oblong Epieres. 



Antennal club obconical, solid, glabrous. 



Prosternal lobe thick, horizontal. Epistoma trun- 

 cate, labrum normal Het.eries. 



Prosternal lobe thin, broad, derlexed. Epistoma 



bifurcate, labrum small Echixodes. 



Antennal cavities slightly behind the anterior angles, 

 open beneath, closed in front by the thickening of 

 the indexed portion of prothoiax. 



Antennas frontal Oxthophiles. 



Antennal cavities at the middle of the thorax beneath, in 



front of the outer portion of the coxa», prosternal 



plate not prolonged laterally. 



Anterior tibiae with moderately large terminal spur. . . 



Anterior tibias dilated, middle and hind tibiae 



-lender Paromalo. 



Tibia: all dilated Dexdrophiles. 



Anterior tibite with small terminal spur. Anterior 

 tibia) slightly dilated, middle and hind tibiae slen- 

 der Axaflees. 



