A REVISION OF THE AMERICAN PAEDERINI.* 
By Tuos. L. Casry. 
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. 
PAEDERINI. 
_ 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- 
Tuary 6, 1905, 
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