Op,^ 



ADVERTISEMENT 



The scientific publications of the National Museum include two 

 series, known, respectively, as Proceedings and Bulletin. 



The Proceedings, begun in 1878, is intended primarily as a medium 

 for the publication of original papers, based on the collection of the 

 National Museum, that set forth newly acquired facts in biology, 

 anthropology, and geology, with descriptions of new forms and 

 revisions of limited groups. Copies of each paper, in pamphlet 

 form, are distributed as published to libraries and scientific organi- 

 zations and to specialists and others interested in the different sub- 

 jects. The dates at w^iich the separate papers are published are 

 recorded in the table of contents of each of the volumes. 



The present volume is the sixty-ninth of this series. 



The Bulletin, the first of which was issued in 1875, consists of a 

 series of separate publications comprising monographs of large 

 zoological groups and other general systematic treaties (occasionally 

 in several volumes), faunal works, reports of expeditions, catalogues 

 of type-specimens, special collections, and other material of similar 

 nature. The majority of the volumes are octavo in size, but a 

 quarto size has been adopted in a few instances in which large plates 

 were regarded as indispensable. In the Bulletin series appear vol- 

 umes under the heading Contributions from the United States Na- 

 tional HerbaHum, in octavo form, published by the National Museum 

 since 1902, which contain papers relating to the botanical collections 

 of the Museum. 



Alexander Wetmore, 

 Assista/nt Secretary, Smithsonian Institution. 



Washington, D. C., June 25, 1927. 



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