2 U. S. p. R. R. EXP. AND SURVEYS ZOOLOGY — 47TH PARALLEL. 



Nearly one half of the species found in Kussian America have become known to me by the 

 kind exertions of my scientific friends, Baron Chaiidoir and Colonel Motschulsky ; and to the 

 latter I am, indebted for his careful comparison of a set of the Californian Coleoptera collected 

 by me, with the original types of Eschscholtz, Mannerheim, and Menetries, by which I have 

 been enabled greatly to increase the accuracy of my investigations. 



The species which remain unknown to me are marked in the catalogue with an inverted 

 comma before the locality, to show that they are placed in the catalogue on the authority of 

 other writers. 



The materials present, for actual investigation, in compiling this report, are therefore : 



1. A series of more than two hundred species from Kussian America, examined and named 

 by Count Mannerheim, sent me by Baron Chaudoir. 



2. A smaller series, containing sii ilar species, together with some Californian types of 

 Eschscholtz, sent me by Colonel Motschulsky. 



3. About fifty species collected by the late J. K. Townsend, M. D., in Oregon, and given me 

 by Mr. Edwin Willcox. 



4. A collection made at Fort Vancouver, by Colonel McCall. 



5. The collections of Dr. Cooper, made in various parts of Oregon, but chiefly at Vancouver 

 and Shoalwater bay. 



6. The collections of Dr. Suckley, made principally at Steilacoom. 

 T. A collection made by George Gibbs, esq., at Steilacoom. 



8. The collections made by myself, at San Francisco and San Jose. 



9. Two collections made in the valley of the Sacramento by Mr. J. Wittick, and presented to 

 me by S. S. Rath von, esq., of Lancaster, Pennsylvania. 



10. Two collections made, the one in the Sacramento valley, the other at San Francisco, by 

 Mr. J. Child, also given me by Mr. Eathvon. 



11. A small but valuable collection from the vicinity of San Francisco, given me by Mr. J. 



P. Wild, of Baltimore. 



The Stapliylinidae are represented in the catalogue by species previously described ; the new 



species collected by me are so numerous, and frequently so closely allied to species of the 

 Atlantic slope of the cuntinent, which are also undescribed;, that it appears to me of no advan- 

 tage to science to make them known separately, but rather to await the opportunity of time to 

 place them in a general synopsis of the Staphylinidae of the United States by genera and tribes. 

 I have, however^ made use of them in constructing the tables of distribution of genera, num- 

 bered I and II. 



Several Curculionidae in my collection have not been described, for the reason that, with the 

 arrangement given by Schonherr in his ^Genera et Species Curculionidum,' I am quite unable 

 to refer them to appropriate genera, while the specific characters do not appear sufficiently 

 remarkable to render them easily identified. 



The collections of Drs. Cooper and Suckley, as made during the survey of the 47th parallel, 

 were placed in my hands for examination by the Smithsonian Institution, to which I am also 

 under great obligations, for the opportunity of examining many other North American insects. 



The distribution of species in the northern part of the region which furnishes the materials 

 for this report, presents no remarkable phenomenon. As in other northern lands, certain tribes 

 like Adephaga, Staphylinidae^ and Elateridae assume a greater preponderance in the fauna, 

 from the fading out of the groups more characteristic of warmer climates, while a greater 



