Coleopterological Notices, VI. 61 T 



The base straight and as -svide as that of the elytra; hody broadly oval 



and strongly convex Cy botllS 



The base straight and narrower than that of the elytra; body elongate 



and snbdepressed Mecy SillUS 



The base evenly arcuate; body narrow and convex, densely fimbriate at 



the sides Acoiiobius 



Scntellum very short and broad, not entering the disk of the elytra; body 

 always completely apterous, the anterior tarsi never dilated in the male. 

 Prothorax not at all fimbriate at the sides. 



Elytra not sulcate, the antennre stout, generally feebly and very gradu- 

 ally incrassate toward tip and without an abruijt club C'oiiibillS. 



Elytra sulcate. 



Antennae with an abrupt three-jointed club; elytral intervals convex 



and asperate :Xocil>iotes 



Antennae with a feeldy differentiated club; elytral intervals convex and 



simply punctate; prothorax not narrowed behind Toiiibius 



Antennae not described; elytral intervals acutely costiform; prothorax 



narrowed behind Tonitoiastes 



Prothorax densely fimbriate along the lateral edges. 



Anterior tibiai narrow and non-fossorial ; body narrow and parallel. 



Conibiosoina 

 Anterior tibiaj broadly triangular and compressed; body stout and oblong- 

 oval XotilJius 



In this table the first five geneva and Conibiosoma remain with 

 the scope originally given them (Col. Not. II, p. 409). Aconobius 

 is fonnded upon Conibiosoma laciniata (Col. Not. Ill, p. 64), 

 and Tonibiastes has for its type Notibius costipennis Horn, re- 

 cently described from Lower California (Col. Baja Cal., p. 430). 

 The other genera are separately alluded to below. 



The scheme of classification originally followed and more re- 

 cently maintained by Dr. Horn for this tribe, can scarcely be 

 regarded as coming within the domain of scientific taxonomy and 

 will ultimately have to be discarded. 



CO^IBIUS Lee. 



The species of this genus can be assigned to three subgenera, 

 which are widely distinct among themselves in point of general 

 appearance, as follows : — 



Head parallel at the sides near the base; basal angles of the prothorax not 

 rounded and nearly right. 



Body parallel, the elytra subeijual in width to the prothorax I 



Body oval the elytra inflated and much wider II 



Head prominent at the sides before the eyes; body stout, parallel and oblong; 



basal angles of the prothorax obtuse and bluntly rounded Ill 



