368 Coleopterological Notices. 



California (Julian). Mr. Dunn. 



Tbiri species is somewhat allied to granicoUis, but differs in its 

 shorter, less slender form relatively wider, more finely and densely 

 tuberculose elytra and very much finer and more asperate punctures 

 of the pronotam ; the elytral tubercles are strongly shining. 



In granicollis the elytra are but just perceptibly wider than the 

 prothorax and are much more elongate-oval. In induraius the 

 space separating the antenna! cavities from the lateral thoracic 

 margin is scarcely two-thirds as wide as in granicollis, and the 

 transverse cavity of the fifth abdominal segment is bounded poste- 

 riorly by an evenly sinuous wall, while in g?-anicollis the posterior 

 wall of the cavity is abruptly and strongly toothed in the middle ; 

 this is a very important difference, for on examining a series of 

 seven specimens of tristis, composed of males and females, I can- 

 not perceive the slightest variation in the form of this curious ex- 

 cavation sexual or otherwise ; in iristis the posterior wall of the 

 cavity has a small rounded lobe in the middle, not by any means 

 as prominent and dentiform as in granicollis. Four specimens of 

 concolor show no variation in the form of the cavity which is nearly 

 as in grayiicollis ; it is also very similar in opacus and gracilis. 



The sculpture of the pronotum in induratus is very nearly as in 

 opacus, but the elytra are entirely different. 



AR^OSCHIZUS Lee. 



The species of this singular genus are remarkably uniform in size, 

 and at the same time strongly isolated and specialized ; those before 

 me may be easily known by the following characters : — 



Anterior and intermediate tibi.-e unarmed. 



Vestitiire of the elytral cost?e erect and fimbriate ; intervals each with a single 

 line of similar but much more widely spaced setse. 



Elytral setas finely spinose costipeniiis 



Elytral setse extremely ooarse, truncate or subclavate at apex ; prono- 

 tum with two fine even lines of setiforin scales iilllbl*ia.tlIS 



Vestiture of the elytral costte broadly squamiform and subrecumbent. 



Elytral intervals each with a median line of scales reglllaris 



Elytral intervals without a median series. 



Prothorax very much shorter and narrower than the head, broadly, 

 strongly, impressed in the middle throughout the length. 



siilcicollis 



