ADVERTISEMENT. 



The publications of the Museum of Zoology, University of ^Michigan, 

 consist of two series — the Occasional Papers and the Miscellaneous Publica- 

 tions. Both series were founded and are being supported by Dr. Bryant 

 Walker, ]\Ir. Bradshaw H. Swales and Dr. W. \V. Newcomb, except that 

 the cost of the illustrations and of distribution are borne by the University. 



The Occasional Papers, publication of which was begun 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 and table of contents are supplied to 

 libraries and individuals on the mailing list for the entire series. 



The Miscellaneous Publications include papers on field and museum 

 technique, 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 will have its 

 own title page and table of contents. 



Ai,e:?Janpe;r G. Ruthven, 

 Director of the Museum of Zoology, 



University of Michigan. 



