AD\'ERTISEAIENT 



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 by Dr. Bryant Walker, Mr. Bradshaw H. 

 Swales and Dr. W. \\\ Newcomb. 



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 IMuseum. The papers are issued separately to 

 libraries and specialists, and, when a sutiticient 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 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 has a 

 title page and table of contents. 



Alexander G. Ruthven, 

 Director of the jVIuseum of Zoology, 



University of Michigan, 



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