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- 

 ^inns! of the National Museum, that set forth newly acquired facts in 



1 ^;fv, rlpscrii3tions of new forms 



quarto size has been adoptea in a, j.cv> ^.. 



were regarded as indispensable. In the Bulletin series appear vol- 

 umes under the heading Contributions from the United States Na- 

 tional Herhariumi, 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. 158 of the Bulletin series. 



Alexander Wetmore, 

 Assistant Secretary, S7nithsonian Institution. 



Washington, D. C, August 16, 1932. 



IV 



