LETTERS OF TRANS:\IITTAL. 



To tJif Honorable the Board of Geological and Biologicid Survey of the 

 State of Michigan: 



Gov. Woodbridge N. Ferris. 

 Hon. Fred L. Keeler. 

 Hon. Thomas W. Nadal. 



Gentlemen: — I have the honor to transmit herewith some mis- 

 cellaneous papers on the zoology of ]\Iichigan, prepared under the 

 direction of Dr. Alexander G. Ruthven, Chief Naturalist, with the 

 recommendation that they be printed and bound as Publication 20, 

 Biological Series 4. 



Very respectfully, 



R. C. ALLEN, 



Director. 



Sir: — I present herewith for publication six papers on the zoology 

 of Michigan, h\ Thomas Hankinson, Roy J. Colbert, Arthur T. Evans, 

 Crystal Thompson, and Arthur W. Andrew's. The investigations 

 upon which these papers are based are a part of or sui)]ilenient the 

 biological work of the Surve}-, and the data which they contain material- 

 ly increases our knowledge of the fauna of the State. 



Respectfully, 



ALEXANDER G. RUTHVEN, 

 R. C. Allen, Director, Chief Naturalist. 



Michigan Geological and Biological Survey. 



