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The scientific publications of the National Museum include two series, known, respec- 

 tively, as Proceedings and Bulletin. 



The Proceedings series, begun in 1878, is intended primaiily as a medimn for the pub- 

 lication 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 pubHshed 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 voliunes. 



The series of Bulletins, the first of which was issued in 1875, contains separate publica- 

 tions comprising monographs of large zoological 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 the 

 Bulletin series appear volumes 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. 



The present work forms No. 207 of the Bulletin series. 



Remington Kellogg, 

 Director, United States National Museum. 



UNITED STATES 



GOVERNMENT PRINTING OFFICE 



WASmNGTON : 19S6 



18 1956 



For sale by the Superintendent of DocamentB. U. S. Government Printing Office 

 Waeliington 25, D. C, Price $5.50 



