E.L. Kalstein 1954 Hydromantes platycephalus April 25 Base of Dentical Rocks, 4100 ft. Yosemite Valley, Mariposa Co., Calif. Steblins collected 2 adults from beneath a granite fragment 2'x3'x8". Overcast cool freeze, air 10°C \frac{1}{2}" above ground 2:30 P.M. (D.S.) Black soil and gray granite fragments where animals taken. Water can be squeezed from soil. Plenty of seeps. This is lowest record of platycephalus but animals must extend down Merced Canyon toward Breeding Springs locality. May 1 Some general locality as above. I covered the base of the cliff over a distance of \frac{3}{4} mile. Only two seepage sites looked promising. One of these probably where Steblins got two animals April 25. No animals taken. Most seep water passing down sheer rock face goes beneath snow directly into rocky soil and does not show up at outer edge of snow patches. May 9 Steblins took several platycephalus at base of granite behind Camp Curry.