E.L. Karlstrom 1954 Ensatiia eschcolti platensis April 25 Base of Cathedral Rocks, 4700 ft., Yosemite Valley, Mariposa Co., Calif., 2:15 P.M. (D.S.T.) I found one adult & (eggs visible) beneath a rotted log. dark brown loam soil beneath. Site shaded by pepperwood tree, slope 20°. Distance from snow perk at base of sheer rock cliff 45 ft. Rotted log 3'x1'x4" thick. May 1 Base Cathedral Rocks, 4100 ft., Yosemite Valley, Mariposa Co., Calif. Adult female under slab of rotted tree 4'x1'x4" thick. Soil temp. 5.8°C. Air temp. 1:50 P.M. (D.S.T.) 8.8°C. Area 90% shaded by maple, pepperwood and oak trees. Douglas fir provide upper canopy. Slope about 10°. Levelled off area about 70' from base of cliff. Same general locality as above but 200 yards E and 75 feet higher altitude. One adult under Doug fir bark 40 feet north of granite base Cathedral Rocks. Cloveral temp. 2:35 P.M (D.S.T.) 10.5°C. Substrate (shaded bulbs) 7.2°C. Shed Cembrotive skin under same piece of larks. Air temp. 2" above ground 11.8°C. Slope 20°. Snow perk at base of cliff 5' thick, 20 feet out from base of tolus slope. Two above specimens left with Doug Hubbard for display behind Yosemite museum.