24 Cincinnati Society of Natiind History 



4 — Apex of prothorax rather feebly impressed behind the processes. 



Form slender; cylindric 5 



Apex of prothorax strongly impressed behind processes. Punctures 

 of elytra finer than those of prothorax. Elytra less than one-half 



longer than wide. Texas and Louisiana piceum 



5 — Elytra fully one-half longer than the prothorax; slender.. Punctures 



very fine, elytra slightly rugose. Canada to P'lorida. .thoracicornc 



More slender than thoracicorne. Processes of thorax longer and less 



divergent. Thorax of female more strongly extended over head. 



Disk of thoi'ax alutaceus and more evenly and coarsely punctured 



than thoracioornc. Indiana oblongus 



Elytra very short and strongly cuneiform; very much less than 

 one-half longer than the prothorax, which is not quite as long as 

 wide. Elytral punctures sparse and A'ery minute. Morgan City, 



La laminifrons 



6 — Thoracic process of male very abruptly formed 7 



Thoracic process of male not abruptly formed, its sides merging 



gradually and obliquely into the sides of prothorax 8 



7 — Elytral punctures rather coarse. Thoracic process one-half as wide 

 as elytra. Clypeal process very broad. California (Southern). 



grossulum 

 Elytral punctures close set. Angles of clypeal process scarcely 

 rounded. Punctures generally very feebly subserial in arrange- 

 ment. Color blackish. California (especially northern coast 



regions) californicum 



Elytra with feebly impressed lines. Punctures feebly subserial in 

 arrangement. Piceous. Elytra paler. Prothoracic process rather 



short. Lamelliform 9 



8 — Prothoracic punctures sparse; angles of clypeal process rounded. 

 Color more or less rufotestaceus, the elytra sometimes blackish 



towards base. California discolor 



Prothoracic punctures fine, dense. Form short, broad and compact. 

 Epistoma rounded in front. Length 2 mm. Width 1 mm. Key 



West, Fla., Round Mountains, Tex compacla 



Narrowly cylindric, blackish, elytra rufescent at tip. Clypeus with 

 the sides strongly convergent, the apex broadly sinuato-truncate, 



with angles blunt. California convergens 



Elongate, cylindric. Head and prothorax red. Elytra blackish. 

 Head with the front strongly concave. Angles of processes sharp. 



Corvallis, Ore oregonus 



[jarger, elongate, cylindric, black, very shining. Reflexed process 

 of epistoma very prominent; deeply sinuate; angles sharp. Process 

 of prothorax long and deeply emarginate at tip. Color either 

 piceous or with elytra piceous and prothorax red. Middle Park, 

 Colo., Grant Co., New Mexico coloradense 



