ADVERTISEMENT 



The publications of the Aluseum of Zoology, University of 

 Michigan, consist of two series — the Occasional Papers and the 

 ?vliscellaneous Publications. Both series were founded by Dr. 

 Bryant A\'alker, ]\Ir. Bradshaw H. Swales and Dr. W. W. 

 Newcomb. 



The Occasional Papers, publication of which was be- 

 gun in 1913, serve as a medium for the publication of brief 

 original papers based principally upon the collections in the 

 Museum. The papers are issued separately to libraries and 

 specialists, and, when a sufficient number of pages have been 

 printed to make a volume, a title page, table of contents, and 

 index are supplied to libraries and individuals on the mailing 

 list for the entire series. 



The Aliscellaneous Publications include papers on field and 

 museum techniciue, monographic studies and other papers not 

 within the scope of the Occasional Papers. The papers are 

 published separately, and, as it is not intended that they shall 

 be grouped into volumes, each number has a title page and 

 table of contents. 



Alexander G. Ruthven, 

 Director of the Museum of Zoology, 



University of Michigan. 



