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 primarly as 
a medium for the publication of original papers, based on the 
collections 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-fifth of this series. 
The series of Bulletins, the first of which was issued in 1875, 
contains separate publications comprising monographs of large 
zoological groups and other general systematic treatises (occa- 
sionally 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 Bul- 
letin 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 relat- 
ing to the botanical collections of the Museum. 
ALEXANDER WETMORE, 
Secretary, Smithsonian Institution. 
II 
