Bartholomew Itinerary 9 mi. W + 5 1/2 mi. S Searchlight, 4300 ft., Clark Co., Nevada an old abandoned railroad to our present camp. After dinner I went out hunting and shot two Dipodomys mohavensis with the aid of a flashlight. I set out one hundred mouse traps on the first flat above a wash. The area is covered with a good stand of Joshua trees, Yucca mohavensis, catclaw and scattered clumps of dry grass. I caught 3 ♀ and 3 ♂ Dipodomys merriami, 2 ♀ + 2 ♂ Dipodomys mohavensis, 1 ♀ Onychomys torridus, and 3 ♂ + 1 ♀ Peromyscus maniculatus. Aug. 1 W side Colorado R., 6 mi. N Calif. line, 500 ft., Clark Co., Nevada Yesterday we broke camp about 1:00 p.m. and drove south on U.S. 95 to the old government road to Fort Mohave and drove on it down to the Colorado River. We are camped on the flood plain of the river between the willows and the desert. I set out 100 traps (95 mouse + 4 rat traps). The mouse traps were set among creosote bushes either along sandy washes or on the rock ridges, and a few were set along the edge of the willows on the edge of the flood plain. My catch was 2 ♀♂ Peromyscus eremicus, 15 ♀ and 8 ♂ Dipodomys merriami, 8 ♀ and 8 ♂ Perognathus parvus. Total 41 mice. When I went down to the river Red Stone and I saw a Bampiseltis getulus which we caught. I also caught 3 toads, presumably Scaphopus. Aug. 2 Red Stone and I took the truck and drove to W side Colorado R., 450 ft., 1 mi. N Calif line, Clark Co., Nevada trying and catch Perognathus longimembris. I set out 89 mouse