ludavis. 1940-1941. Dec.31. 16 mi. SE Fortuna Mine, 300', Yuma Co., Ariz. into a main wash paralleling the base of the Butler Mts. to the S. W. Creosote bush and Franseria dumosa predominant, with palo verde and desert ironwood in the washes, and scattered saguaro and cholla (two kinds). The mts. are of weathered granite, very crumbly. Set traps to the NW of camp in the recently flooded washes and on the sandy plain. Jan.1. Ran traps and skinned a.m. 2 Dipodomys ervianus and 1 D. deserti. Cicked up line Set in low lying granite hummocks and in the rocks at the bases of the Butler Mts., set out a few rat traps in the hummocks for Willets (Amosfermofhildus), whose presence was noted due to deposits of droppings. Weather cloudy most of the day, clearing about 4 p.m. Jan.2. Ran traps. 6 Peromyscus maniculatus, 1 Neotoma, 5 D. ervianus. Skinned a.m. Moved some traps and set others in P.M. Skinned some more after supper. Found 1 Peromyscus maniculatus in traps in P. m. Evidently these mice work some in the daytime. In a.m. Sibley & I saw tracks of mountain sheep in a dry wash near camp, evidently a few of the sheep in transit from the Butlers to the Gildas. Sibley had previously