ADVERTISEMENT 



The scientific publications of the National Museum consist of two 

 series — Proceedings and Bulletins. 



The Proceedings, the first volume of which was issued in 1878, are 

 intended primarily as a medium for the publication of original 

 papers based on the collections of the National Museum, setting 

 forth newly acquired facts in biology, anthropology, and geology 

 derived therefrom, or containing descriptions of new forms and 

 revisions of limited groups. One or two volumes are completed 

 annually and copies of each paper, in pamphlet form, are dis- 

 tributed as soon 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 the volume. 



The Bulletins^ the first of which was issued in 1875, consist of a 

 series of separate organizations comprising chiefly monographs of 

 large zoological groups and other general systematic treatises (occa- 

 sionally 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 Contri- 

 hutions from the National Herhariutn^ has been published as 

 bulletins. 



The present work forms No. 132 of the Bulletin series. 



Washington, D. C, December 7, 1925. 



Alexander Wetmore, 



Assistant Secretary, 

 In charge of the United States National Museum. 



