346 JOHN HAMILTON, M. D. 



not in our present catalogue. Several of these species have been 

 admitted with hesitation, as Ostoma grossum and ohlongum, Lcemoph- 

 loeus fractipennis, Crypiophagus aeutangulus, etc., because they are 

 unknown here, and European authors merely mention them as oc- 

 curring in North America, which may be anywhere from the Isthmus 

 of Panama to the North Pole. About thirty others could have been 

 inserted with the same indefinite locality, but there is no certainty 

 that any of them occur north of Mexico. 



The elaboration of the American distribution has required much 

 research. The general literature of American coleopterology and a 

 portion of the European had necessarily to be carefully gone over. 

 The numerous local catalogues and lists ])ublished by collectors un- 

 derwent examination. The more prominent of these are referred 

 to throughout the work, a list of which has been published in the 

 sixth volume of "Psyche," entitled: "A list of some of the cata- 

 logues and local lists of American Coleoptera." The circumpolar 

 and Alaskan distribution is largely due to the works of Mannerheim, 

 F. W. Maeklin and J. Sahlberg. Mannerheim's Beitrag and 

 Nachtrage to Russo-American coleopterology, are now embraced in 

 the catalogue of the Coleoptera of Alaska published in the present 

 volume of the Transactions, while Maeklin's principal works on 

 the subject are entitled — Bidrag till Kannedom om insehternas geo- 

 grafiska nth'edning i Norden med hufvudsakligt ascende pa Skmidi- 

 naviens och Finnlauds Fauna, Helsingfors, 1853 ; and Bidrag till 

 Kannedom om sakallade vikarierande former bland Coleoptera i Nor- 

 den, Helsingfors, 1855 ; and finally, valuable unpublished distribu- 

 tion has been obtained from several private collections, notably from 

 Mr. F. Blanchard's Mr. W. H. Harrington's, Mr. H. Ulke's and 

 my own. 



The Asiatic distribution is derived from a variety of sources, and 

 those desiring to pursue the subject further will find a very complete 

 bibliography in The Catalogue of the Coleoptera of Siberia and the 

 Kuss- Asiatic provinces, by Lucas von Heyden, Berlin, 1880-81 ; 

 and further information in articles by various writers published 

 subsequently in "Deutsche Ent. Zeitschrift," etc. The European 

 and other distribution is largely due to Mr. A. Fauvel in the list 

 previously cited. 



