Number 69 April 25, 1919 



OCCASIONAL PAPERS OF THE MUSEUM OF 

 ZOOLOGY 



UNIVERSITY OF MICHIGAN 



Ann Arbor, Michigan Published by the University 



THE AMPHIBIANS OF THE UNIVERSITY OF 



MICHIGAN-WALKER EXPEDITION 



TO BRITISH GUIANA 



By Alexander G. Ruthven 



The expedition^ which was sent to British Guiana in the 

 summer of 1914 secured a collection of amphibians which is of 

 interest because of the new locality records, for the data on 

 habits which accompanies it, and for the additional knowledge 

 which it affords of the variability of several species. The 

 party, consisting of F. M. Gaige, the writer, and native assist- 

 ants, was in the field from July 14 to September 5, and most 

 of the time was devoted to the study of the ants, amphibians, 

 and reptiles. 



The area covered by the field work comprised about sixteen 

 square miles on the west bank of the Demerara River about 

 Hyama Creek and the plantation known as Dunoon. The topo- 

 graphy of the region consists of low detrital plains along the 



^ An account of this expedition is given in the Annual Report of the Director 

 of the Museum of Zoology for the year 1914-1915. 



