PROCEEDITSIGS 



OF THK 



WASHINGTON ACADEMY OF SCIENCES 



VoT.. IX, pp. 275-523. October 18, 1907. 



A REVISION OF THE AMERICAN COMPONENTS 



OF THE TENEBRIONID SUBFAMILY 



TENTYRIIN^. 



By Tiios. L. Casey. 



Several of the groups reviewed in the following pages have 

 formed the subject of previous study on the part of the writer, 

 either monographically, as in the case of the genera allied to 

 £urymetopon^ or as detached new species, and the present 

 opportunity is embraced to give a connected view of the entire 

 series, in that part of the great family Tenebrionidse having the 

 abdominal segments unmodified by a coriaceous hind margin 

 and the middle coxae enclosed externally by the sterna alone, 

 without the intervention of a small piece attached to the coxae 

 and sometimes separating the sterna, known as a trochantin. 

 This is the definition of the subfamily Tentyriinae as given by 

 LeConte and Horn, and is adopted for the present revision, 

 although reasons will be given further on for a belief that it is 

 not an entirely natural subdivision, there being two great groups 

 included, characterized principally by the development of the 

 mentum, which apparently affords a better line of delimitation 

 for subfamily groups than the presence or absence of a trochan- 

 tin. However, this is more a matter to be discussed in a general 

 revision of the family than at the present time, and the follow- 

 ing work is presented simply with the hope that it may prove 

 useful in giving some slight conception of a problem in classifi- 

 cation, the difficulties and uncertainties of which are well known. 

 Perhaps the most perplexing feature pertains to the differenti- 



Proc. Wash. Acad. Sci., October, 1907. 275 



