Coleopterological Notices, V. 509 



CLAVIGERIN^. 

 Fustiger Leo. 

 faehsi Bndl. A. 



californicas BndL S. 



In this list the succession of names in the various genera is, as 

 nearly as possible, that recently given by Dr. Brendel. The letters 

 placed after the various species are intended to give a general idea 

 of their geographic distribution; they represent (A) the Atlantic 

 regions of the continent, (G) the Gulf States from Florida to Texas, 

 (M) the Missouri region including the Great Lakes, (S) the Sonoran 

 region from vi'estern Texas and Utah to southern California, and 

 (P) the true Pacific Coast fauna. Because of insufficient data, no 

 form of nomenclature more discriminating than this can be em- 

 ployed at present. 



In comparing this list with the most recent catalogue of the 

 European species, there are only three points to which special 

 attention need be invited: — 



1 — The species are but slightly more than one-half as numerous 

 as those at present recognized as valid in the European fauna. 



2 — The genera, however, exceed in number those of Europe by 

 about one-third, with twelve, viz. : Euplectus, Bibloplectus, Bib- 

 loporus, Batrisus, Bryaxis, Reichenbachia, Rybaxis, Bythinus, 

 Tychus, Pselaphus, Sognorus and Tyrus common to the two con- 

 tinents. 



3 — There are no species at present recognized as being common 

 to Europe and America. 



The original estimate of LeConte, that the pselaphide fauna of 

 North America surpasses in richness that of Europe, is true I think 

 as far as the genera are concerned, but not in regard to the species. 

 The conditions of land, water and mountain distribution, with re- 

 sultant climate, are so much more varied in the vast expanses from 

 Cape North to Gibraltar and the Caucasus, that it is not probable — 

 in spite of the subequality of land area — that the species of America 

 will be found to approach in number those of Europe, even when 

 the two regions are similarly explored, especially, also, as there 

 seems to be no difference in the relative abundance of individuals 

 in the palaearctic region. That the number of genera in the United 

 States should be greater, is to be accounted for, partially at least, 

 by the fact that many neotropical genera such as Thesium, Arth- 

 mius, Pselaptus and Ctenisis so readily find their way across our 

 Mexican frontier. 



