Lee Arnold Horse Canyon, 5,800 ft Pahrum Pk., Washoe Co., Nevada 1937 Itinerary May28 apparent, however, that wood rats were present by the sign along the ledges of the cave. Evidently they hopped from ledge to ledge to avoid getting into the water. The 7th cave contained nothing of interest while the 8th cave was partly submerged by water. May29 Yesterday afternoon I ran a trapping line of 75 traps west of the camp. Fifty of the traps were along or near the streambed while the rest were in the brush up a side canyon below the location of the mines. I also set out four gopher traps (sets) near camp and one about 1/4 mile down the road. In two of the mines I set rat traps for wood rats. In the traps set along the creek I caught three Peromyscus maniculatus and one Microtus mordax. In the traps set up the side canyon I caught one Perognathus parvus. In the traps set in and around the mines I caught one & Neotoma cinerea and two Peromyscus maniculatus. In the gopher traps near camp I caught one ? Thomomys quadratus. The habitat of these specimens will be described in the species accounts. May30 Yesterday afternoon Dr. Fitch and I drove down canyon to set our traps. We stopped at a farmhouse on the way down to enquire as to where we could find various animals. The fellow living there told us