Vol. 5, p. 403-421. October 10, 1931. 



Occasional Papers 



OF THE 



Boston Society of Natural History. 



THE AMPHIBIANS OF BARRO COLORADO ISLAND. 1 

 BY EMMETT R. DUNN. 



Thanks to the kindness of Dr. Thomas Barbour, and to the 

 administrators of the John Simon Guggenheim Memorial Fellow- 

 ship, I have been enabled to make a considerable study of the 

 herpetological fauna of lower Central America, both in the field, 

 and in museums at home and abroad. 



The present paper is an attempt to put some of my notes into 

 an immediately useful form. It is primarily a guide to the 

 species of amphibians found on Barro Colorado Island, their 

 habits and habitats. I have added those species known from 

 the Panama Canal Zone, and those known from the provinces of 

 Panama and Colon, which surround the Zone. 



I shall not attempt to repeat what has been so often and so 

 well done, a general description of Barro Colorado Island. I 

 shall merely indicate here the dates of the extremely pleasant 

 occasions when I sojourned on the island: Nov. 12-Dec. 24, 1928; 

 Feb. 8-16, 1929; July 15- Aug. 2, 1930. In order to give meaning 

 to dates mentioned in the accounts of the species; I give the 

 rainfall data for the time I spent on the island. During February, 

 1929, rain fell twice, 0.05 inches, and 0.02 inches. 



Date 



Inches 



Date 



Inches 



Date 



Inches 



Nov. 11 



0.13 



Nov. 21 



0.04 



Dec. 1 



0.01 



12 



0.83 



22 



0.36 



2 



0.01 



13 



0.40 



23 



0.11 



3 



0.00 



14 



2.84 



24 



0.14 



4 



0.05 



15 



0.20 



25 



0.20 



5 



0.04 



16 



0.00 



26 



0.34 



6 



0.50 



17 



0.20 



27 



1.49 



7 



0.69 



18 



0.64 



28 



0.10 



8 



0.24 



19 



3.64 



29 



0.04 



9 



3.79 



20 



2.34 



30 



0.01 



10 



0.45 



Contributions from the Department of Biology, Haverford College, no. 6. 



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