ADVERTISEMENT. 
The scientific publications of the United States National Museum consist of 
two series, the Proceedings, and the Bulletins. 
The Proceedings, the first volume of which was issued in 1878, are intended 
primarily as a medium for the publication of original, and usually brief, papers 
based on the collections of the National Museum, presenting newly-acquired facts 
in zoology, geology, and anthropology, including descriptions of new forms of ani¬ 
mals, and revisions of limited groups. One or two volumes are issued annually 
and distributed to libraries and scientific organizations. A limited number of 
copies of each paper, in pamphlet form, is distributed to specialists and others 
interested in the different subjects as soon as printed. The date of publication is 
printed on each paper, and these dates are also recorded in the tables of contents 
of the volumes. 
The Bulletins, the first of which was issued in 1875, consist of a series of separate 
publications comprising chiefly monographs of large zoological groups and other 
general systematic treatises (occasionally in several volumes), faunal works, reports 
of expeditions, and catalogues of type-specimens, special collections, etc. The 
majority of the volumes are octavos, but a quarto size has been adopted in a few 
instances in which large plates were regarded as indispensable. 
Since 1902 a series of octavo volumes containing papers relating to the botanical 
collections of the Museum, and known as the Contributions from the National Her¬ 
barium, has been published as bulletins. 
The present work forms No. 125 of the Bulletin series. 
William deC. Ravenel, 
Administrative Assistant to the Secretary, 
In charge of the United States National Museum. 
Washington, D. C., May 14, 1923. 
n 
LIBRARY OF CONGRESS 
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