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University of California Publications in Zoology [Vol. 27 
Zone. Frank Valley and Papermill Creek are on the boundary 
between the Transition and Upper Sonoran zones. In most of the 
instances of spawning given in the table the frogs were collected in 
the field and taken to the laboratory, where they spawned one or more 
days later. In these cases the dates given are those of the day follow- 
ing the night during which eggs were laid, save in a few cases expressly 
indicated otherwise. For the data pertaining to the years from 1916 
to 1921 I am indebted to Dr. P. E. Smith, of the Department of 
Anatomy, University of California, who has collected Rana boy Hi for 
use in his experimental work on the hypophysis (P. E. Smith, 1920). 
Mr. Frank Bassett supplied the material dated April 21, 1922. 
Spawning Dates- of Eana boylii boylii in Central California 
Locality from which frogs were obtained or 
where eggs were found in stream 
Date 
Remarks 
San Pablo Creek, Contra Costa Co 
Apr. 1, 1913 
Frank Valley, Marin Co 
Apr. 14, 1916 
San Pablo Creek, Contra Costa Co .... 
Apr. 17, 1916 
Laurel Dell, Marin Co 
Mar. 28, 1917 
and until 
Apr. 9, 1917 
Frank Valley, Marin Co 
Apr. 22, 24, 
and 25, 1917 
Niles Canon, Alameda Co 
Prior to Apr. 
3, 1918 
Niles Canon, Alameda Co 
Apr. 20, 1918 
Last eggs here laid on this 
San Pablo Creek, Contra Costa Co 
Prior to Apr. 
15, 1919 
date 
San Pablo Creek, Contra Costa Co 
Apr. 17 and 
19, 1919 
Niles Canon, Alameda Co 
Apr. 22, 1919 
Nine egg masses found in the 
creek in various stages 
Frank Valley, Marin Co 
Apr. 5, 9, 13, 
and 29, 1921 
Frank Valley, Marin Co 
Isabel Creek (near entrance of Long 
Branch), Mount Hamilton, Santa 
Apr. 10, 1922 
Clara Co 
Apr. 21, 1922 
Frank Valley, Marin Co 
May 1, 1922 
Eight masses in the creek in 
various stages of develop- 
San Pablo Creek, near Orinda, Contra 
ment 
Costa Co 
Apr. 20, 1923 
Two masses in the creek, 
Papermill Creek, near Tocaloma, 
started in development 
Marin Co 
May 5, 1923 
About 25 masses in the 
creek, some recently laid, 
some with development 
under way, some hatch- 
ing; one ‘ripe’ female 
