ADVERTISEMENT. 



The publications of the Aluseum of Zoology, L'niversity 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, Mr. Bradshaw H. Swales and Dr. W. W. Newcomb, except that the 

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



The Occasional Papers, ])ublication of which was begun in 19 13. serve 

 as a medium for the jniblication of l)rief original papers based principally 

 upon the collections in the Museum. The papers are issued separately to 

 libraries and specialists, and, when a suftlcient 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 }^Iiscellaneous Publications include ])apers on field and mu.seum" 

 techniciue. monograj)hic studies and other j)ai)ers not ^^•ithin the scope of 

 the Occasional Papers. The papers arc published separately, and, as it is 

 not intended that they shall be grouped into vohnnes. each number has a 

 title page and table of contents. 



Alexander G. Rl T(ivex. 

 Director of the Museum of Zoology, 



University of Michigan. 



