B. Brylski 1981 Journal Corral Hollow. 3 Aug. 6:15 am Rob't Seib & I leave Berkeley in my trust vw long. 7:40 am Arrive at Castle Rock after driving Mines & Tesla Rbs for snakes. Set out 60 Sherman live traps w/ rolled oats bait. Moon is 1/4, night temperature round 70 F, wind is 15 or so mph from north. 4 Aug. 1am leave Berkeley for Corral Hollow. 8am arrive on site. First line of 20 shermans is along north slope and base of Castle Rock. Grass is annual, 100% cover, 4-8" tall. Some rocks but mainly sloping grassland. No captures, no sprung traps. 2nd line runs along entrance Rd, just opposite Castle Rock (on E side of rd.), up into the rocky cyn - the only prominent one to the east of Castle Rock. Grassland, some chaparral scrub in the draw. The 2nd line of 20 - ups the canyon & above mi hill top grassland E to the escarpment yielded 1 Perognathus californius, 1 Dip's heermanni, 1 Reithrodontomys, 1 Peromyscus maniculatus. The kangaroo rat & pocket mouse were captured in the rocky scrub habitat which is found in the canyon floor 1/2 or so up the canyon. The trap success in the open grassland was dismal - despite apparently good burrowing conditions & full vegetative cover (grasses /forbs). The 3rd line of 20 sherman in rolling open grassland starting at the escarpment, in direction of Castle Rock, yielded nothing. 10am leave Corral Hollow for Berkeley.