Erickson 1934 Tule Tank 1250 ft. Yuma Co., Ariz. 13. Jan. 18. Moved from Tinajas Altas to Tule Tank during day; road crossed desert plain, shallow wash small lava beds. Country at Tule Tank very similar to that at Tinajas Altas except mountains of tanks are not as high and other ranges are closer. Tank is in canyon that ascends gradually to top of range, running S.E.-N.W. Tank is shallow with sandy approach on lower side; only about a foot of water, pool about 3 by 1 ft. across; about 1600 ft up canyon from mouth; similar canyon mine tank just east; Vegetation the same as at Tinajas Altas. Set 42 medium sized traps on NE facing slope of canyon going up rocky draw and along range above the tank. Set 42 more in wash and plain at mouth of canyon. Bat seen at dusk, feeding over and about ironwood tree; heard squeaking in same region at 9:30 p.m. Jan. 19. Caught seven Dipodomys m. and two Peromyscus eremicus in traps on flat; was all of these in traps in sandy, well good plant cover none on plain proper. Only two Peromyscus saved. In traps on canyon side took one Neotoma leucida and eight Peromyscus crinatus. Set 42 traps on S.W facing ridge going over crest to N.E facing slope of next canyon.