Palm 1934 Reithrodontomys megalotis 5 mi. E Ontario, 1050 ft., San Bernardino Co., Calif. Dec.22 Caught 1 in 30 gow-size mouse traps set on a sand dune in an old peach orchard. The only plants here were dead Russian Thistle (Salsola kali). This specimen was caught by the tail and taken home alive but I escaped. 2 mi. ENE Ontario, 1100 ft., San Bernardino Co., Calif. Dec.26 Caught three in traps set in small runways in green foxtail grass (Hordeum) 4-10 inches high in the edge of a peach orchard. Jan.7 1935 6 1/4 mi. E Ontario, 1025 ft., San Bernardino Co., Calif. Caught 1 in 64 gow-size mouse traps. This specimen was taken on a flat area by a wash, covered with Erodium and shortgrass with scattered willows and prickly pear cactus.