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 primarily as a 

 medium for the publication of original papers, based on the collec- 

 tions of the National Museum, that set forth newly acquired facts in 

 biology, anthropology, and geology, wath descriptions of new forms 

 and revisions of limited groups. Copies of each paper, in pamphlet 

 form, are distributed as published to libraries and scientific organiza- 

 tions 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 series of Bidlefins^ the first of which was issued in 1875, con- 

 tains separate publications comprising monographs of large zoologi- 

 cal groups and other general systematic treatises (occasionally in sev- 

 eral 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 Bidletin series appear volumes under the 

 heading Contrihutionx from the U nited States National Herhariarn^ 

 in octavo form, jHiblislied by the National Museum since lOO.!, whicli 

 contain papers relating to the botanical collections of the Museum. 



The present Avork forms No. 204 of the Bulletin series. 



Remingtox Kell()(;(!, 

 Director., United States National Museum. 



