ADVERTISEMENT 
The scientific publications of the National Museum include two 
series, known, respectively, as Proceedings and Bulletin. 
The Proceedings, begun in 1878, are intended primarily 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 tables of contents of each of the volumes. 
The present volume is the ninety-seventh of this series. 
The Bulletin, the first of which was issued in 1875, consists of a 
series of separate publications comprising monographs of large zoo- 
logical 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 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. 
ALEXANDER WETMORE, 
Secretary, Smithsonian Institution, 
<{RSONIAN INST Foe 
wr anon’ * 
MAR 2 7 1950 
J 
“Arona museu 
