BULLETIN 39, UNITED STATES NATIONAL MUSEUM. [146] 



these, separate copies also fall into the possession of dealers in second- 

 hand books, and may be purchased from them. The American Ento- 

 mological Society of Philadelphia, and also a few other societies here 

 and in Europe, offer for sale from their duplicates many of these authors' 

 extras, and in some cases publish lists. There are, moreover, certain 

 business establishments which make a specialty of the sale of works 

 and pamphlets on natural history, including entomology, and it is chiefly 

 through such establishments that the student is enabled to secure the 

 larger portion of the works needed. 



By subscribing to the entomological periodicals published in this 

 country (a matter of but slight expense) the student may keep abreast 

 of the current literature. Short book reviews or notes published therein 

 call attention to the more important publications in other countries. 

 Moreover, the Zob'logischer Anzeiger, edited by Prof. J. Victor Cams, 

 in Leipzig, Germany, and published every fortnight, gives a tolerably 

 complete bibliography of the current entomological literature at inter- 

 vals of about six or eight weeks. The " Naturse Novitates," published 

 every fortnight by E. Friedlaeuder & Sohu, Carlstrasse, 11, Berlin, Ger- 

 many, gives the titles of most recent works and pamphlets. 



There are also three great annual publications, viz : u Die Fortschritte 

 auf dem Gebiet der Entomologie," published in Wiegmaun's "Archiv 

 fiir Naturgeschichte ; " "The Zoological Record," published by the 

 Zoological Record Society, in London, England; and the "Zoologist-he 

 Jahresberichte," published by the Zoological Station at Naples, Italy, 

 which give the full literature of the previous year, discussing the more 

 important papers and giving a list of the new species, besides other 

 information. These three publications are almost indispensable to the 

 student in any branch of zoology, and some one of them at least ought 

 to be found in every public library in the country. The volumes of the 

 "Zoologische Jahresberichte" since 1887 contain no titles upon sys- 

 tematic and classificatory zoology, but only such as refer to biology. 



A not inconsiderable portion of the North American literature on the 

 classification of insects has been published by the Government of the 

 United States through various channels, foremost among which are the 

 Smithsonian Institution, the U. S. Department of Agriculture, the U. 

 S. National Museum, the U. S. Geological and Geographical Survey, and 

 the various surveys of the Territories. Some of these publications are 

 distributed free of cost; while others, like certain of the publications of 

 the Smithsonian Institution and the Geological Survey, are sold at a 

 moderate price to cover the cost of publication. Many of them are out 

 of print, and can only be obtained through natural history book-dealers. 



Of the more general works, some may be obtained direct from the 

 publishers, and in such cases the publishers are mentioned in the 

 general list. The older works are mostly out of print and can only be 

 obtained from second-hand dealers. The current State reports of Lint 

 uer and Forbes may be obtained from the secretaries of the respective 



