238 University of California Publications in Zoology [Vol. 27 
San Gabriel a slightly longer season of inactivity is indicated. But 
draytonii goes through nothing like the real winter hibernation which 
the ranas of eastern North America experience. 
The call of this frog is a series of low tremulous or ‘ gurgling ’ 
notes, resembling somewhat the notes uttered by j Rana boylii. The 
notes may be given when a captive frog is held in the hand, especially 
during the breeding season. Camp (MS) states that when seized 
suddenly and roughly, draytonii will sometimes open its mouth widely 
and deliver a “piercing human-like scream.” The same observer 
reports that frogs of this species were heard ‘croaking’ in November, 
1909. 
Draytonii is one of the earliest amphibians to spawn in California. 
In the neighborhood of Berkeley it is third in the sequence of the 
aquatic species, being preceded by Triturus torosus and Hyla regilla. 
In the neighborhood of Los Angeles it precedes one if not both of 
those species. Most- of the data on life-history presented below have 
been obtained from observations at a pond situated in the hills about 
3 miles southeast of Berkeley near Thornhill station on the San Fran- 
cisco-Sacramento Railroad. This pond is known to local naturalists 
as “Lone Willow Pond,” but throughout the present paper is desig- 
nated as “Thornhill Pond” (pi. 3, fig. 5). The pond is an artificial 
one, and, according to Dr. A. M. Meads (MS), the red-legged frog was 
‘planted’ there a number of years ago by H. 0. Medau who then con- 
ducted a frog farm at the place. 
Data for spawning are as follows : 
March 24, 1917, embryos about 4 mm. long (P. E. Smith, MS). 
February 18, 1919, 1 mass, jelly not yet swollen to normal size. 
February 6, 1921, 3 masses; eggs in early stages of cleavage. 
February 21, 1922, 9 masses; eggs unsegmented or in early stages of 
cleavage. 
February 18, 1923, 1 mass; eggs in morula stage. 
In the Arroyo Seco, opposite Avenue 66, in the Highland Park 
district of Los Angeles, Dr. Loye H. Miller found an egg mass of this 
species on January 21, 1923, which already contained elongated em- 
bryos ; other egg masses in early stages of cleavage were found there 
on January 28, 1923 ; in 1924, eggs in the two-cell stage were found 
in the same place on January 9. Camp (MS) states that in the vicin- 
ity of Sierra Madre, Los Angeles County, the months of J anuary and 
February seem to mark the height of the breeding season. January 9, 
1910, is a date of record there. He also states that eggs were laid by 
