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 
recorded in the table of contents of each of the volumes. 
The present volume is the ninety-second of this series. 
The series of Bulletins, the first of which was 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 Na- 
tional Herbarium, in octavo form, published by the National Museum 
since 1902, which contain papers relating to the botanical collections 
of the Museum. 
ALEXANDER WETMORE, 
SK Assistant Secretary, Smithsonian Institution, 
