ADVERTISEMENT 



Tlie scientific publications of the National Museiun 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 

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



The present volume is the eighty-fifth of this series. 



The series of Bullefiiix, the first of which w^as issued in 1875, con- 

 tains separate publications comprising monographs of large zoologi- 

 cal groups and other general systematic treatises (occasionally in 

 several volumes), faunal works, reports of expeditions, catalogs 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 

 National Herhaiiuni.^ in octavo form, published by the National Mu- 

 seum since 1902, which contain papers relating to the botanical 

 collections of the Museum. 



Alexander Wetmore, 

 Assistant Secretary., Smithsonian Institution. 



Washington, D. C, February 12^ 19^0. 



