274 University of California Publications in Zoology [Vol. 27 
attached. They vary greatly in size, but average about a pint in bulk. In one 
case where the eggs were counted, a laying consisted of over fifteen hundred eggs. 
The eggs are relatively large, measuring nearly 2 mm. in diameter. Each egg 
is in a transparent sphere of jelly measuring one -half inch across. The eggs 
are placed in the shallow, marshy pools near a lake, but never in the deep lake- 
water itself. The length of time required for hatching is from one to two weeks, 
varying with the temperature; those in the warm, shallow water hatching earlier 
than those in deep water. The later development is slow, and it is not until after 
the summer is passed that the tadpole becomes a frog. This development is perhaps 
correlated to [with] the conditions of the region of the frog ’s range. There is an 
abundance of water in this region, even in summer, so that the development is not 
hastened by the drying up of the pools. 
From this time on the growth is slow; at least, there can be found, each spring, 
frogs of four or five different sizes, so that it would seem as though they require 
four or five years to reach the adult size. 
Blanchard (1921, p. 6) says that at Springdale, Stevens County, 
Washington, this species is common along streams but nowhere plenti- 
ful. “A stupid frog, easily caught; neither a strong jumper nor a 
fast swimmer. The salmon color of the underside is absent from the 
newly transformed adult ; it increases in extent and brilliancy with 
increase in size, occasionally overspreading nearly the entire under 
surface of a large adult.” 
A young individual of pretiosa, 26.4 millimeters in head-and-body 
length, hence of the season’s brood, collected on Warner Creek, altitude 
6600 feet, Shasta County, California, September 19, 1923, is a partial 
albino, lacking entirely the black normally present in the coloration 
of this subspecies. The spots on the back are here brown ; the dorso- 
lateral folds are pale yellow where normally dark brown, the limbs 
pale yellow, the location of the normal blackish crossbars being indi- 
cated by slightly darker yellow. The mottled pattern of the throat 
region, normally dusky, is indicated by faint yellow. This is the first 
instance of partial albinism which has come to attention in the present 
study of the amphibians of California. 
Rana pretiosa luteiventris Thompson. Nevada Spotted Frog 
Bana temporaria pretiosa \, Cope (1883, p. 433). In Modoc County, Cali- 
fornia. 
Bana pretiosa luteiventris Thompson (1913, pp. 53-56, pi. 3 [figs. 2, 3]). 
Original description, type from Anne Creek, Elko County, Nevada. 
Bana pretiosa luteiventris, Camp (1917&, pp. 123, 124). Characters; occur- 
rence in California. 
Bana pretiosa luteiventris, Grinnell and Camp (1917, p. 148, fig. 5). Range 
in California. 
Bana pretiosa luteiventris, Stejneger and Barbour (1917, p. 39; 1923, p. 
36). Range. 
