Villablanca 1988 Dipodomys penantimus West Slope Walker Pass, Kern Co. Calif 4600 St. (7 Sept 1988) These k-rats occurred in a great basin scrub/joshua tree woodland. The dominant plants were Artemisia tridentata, Cuphothamnus mauricus + Yucca brevifolia. Associates were Salvia doré, Pinus monophylla + Tuipeana californiana, Eriogonum fascicu- latum and interior goldenbrush. 1) Areas of high density appeared to decorrelated with Joshua Trees. These areas were also littered with burrow openings and surface pit castles. 2) The surface pit castles were very large in some cases, being up to 1½" wide and 1½" deep and also upside down U shaped. 3) Upon release most of the animals would hop off to a burrow (rather than cores). The paws were in a digitigrade manner with the posters much like that seen in the frontpiece to Grinnells 1922 k-rat publication.