North (copy) EPN Perognathus Arroyo Seco, Imperial Co., Calif. Dec. 21, 1938 One taken on sandy ground just above flooding level, with creosote bush the only vegetation. Dec. 22, 1938 - One taken on sandy ground in same area as last night. Dec. 23, 1938 - One taken on ground covered with small rocks and some dark soil beneath. This ground appeared to be volcanic. Dec. 29, 1938 - 3 taken on rocky slope and on flat at top of slope. Only vegetation is a low grey bush - possibly (Artemisia) and another low bush with many spines, some creosote bush was present also. All vegetation was well scattered. Jan. 5, 1939 - Koford took one at our camp 4 mi. N of Lake Arrowhead, San Bernardino Co., Calif.