A REVISION OF THE AMERICAN PAEDERINL* 



By Thos. L. Casey. 



The following revision has been long in contemplation, but 

 it is only recently that the author has felt warranted in begin- 

 ning the study of so great a multitude of species, most inter- 

 esting and instructive though they are in their varied struc- 

 tural characters. They indeed form a taxonomic problem 

 hardly less fascinating, though rather less difficult, than that 

 afforded by the still more numerous Aleocharini, the latter 

 being; even more diversified in structure and more involved in 

 their relationships with the other tribes of Staphylinidae. But 

 few of our described species are not included in the material 

 serving as the basis of this revision and it is hoped that the 

 relationships of the various genera and species are given with 

 sufficient clearness to enable the student to identify and 

 arrange his material, with a view to the gradual evolution of 

 a more complete and cosmopolitan comparative morphology 

 of the tribe. With this end in view all genera, native and 

 foreign, of which it was possible to procure examples, have 

 been included in the tables, but the only species considered, ex- 

 cepting typical representatives of hitherto undescribed foreign 

 genera, are those which occur in North America above the 

 northern boundary of Mexico. 



St. Louis, Mo., Sept., 1904. 



PAEDERINL 



The Paederini include all those Staphylinidae, with large 

 anterior coxae, having the fourth joint of the maxillary palpi 

 small and either aciculate, conical or specially modified in 

 structure and the antennae remotely separated and inserted at 



* Presented by title before The Academy of Science of St. Louis, Feb- 

 ruary 6, 1905. 



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