ADVERTISEMENT 



The scientific publications of the National Museum include two 

 series, known, respectively, as Proceedings and Bulletin. 



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

 medium for the publication of original papers, based on the collec- 

 tions 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 

 organizations and to specialists and others interested in the different 

 subjects. 



The dates at which these separate papers are published are re- 

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



The Bulletin, series, the first of which was issued in 1875, con- 

 sists of separate' publications comprising monographs of large zoo- 

 logical groups and other general systematic treatises (occasionally 

 in several volumes), faunal works, reports of expeditions, cata- 

 logues of type specimens aud special collections, and other material of 

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

 but 'a quarto Sjjze ha£ Deeh adopted in a few instances in which large 

 plates were regarded as indispensable. In the Bulletin series appear 

 volumes under the heading Contributions from the United States 

 National Herbarium, in octavo form, published by the National 

 Museum since 1902, which contain papers relating to the botanical 

 collections of the Museum. 



The present volume forms No. 161 of the Bulletin series. 



Alexander Wetmore, 

 Assistant Secretary, Smithsonian Institution. 



Washington, D. C, May 12, 1932. 



