Murray 1948 153 Journal July 10 10 mi SE Mesquital, 400 ± ft., Baja Calif. Mammals found here were: Perognathus arenarius — Abundant in the wash with a very few on the hard ground of the flat. Perognathus baileyi — Uncommon, found on the brushy flat only. Averaged not much more than 1 per 50 traps. Perognathus spinatus — Caught 3 on gravelly or rocky banks. Levis also caught just a few Peromyscus maniculatus and eremicus. Dipodomys agilis — Abundant in all parts. May have been more so but the live traps are a little small for them. Dipodomys merriami — About as common as agilis, possibly more frequently taken on the brushy ground. Neotoma lepida — Numerous houses in the brush, and also holes in banks. Thomomys bottae — Not too numerous, though well concentrated in one place. One gopher seems to range widely. Iepus californicus — A great many here, apparently grouped in certain parts. Sylvilagus bachmani — Very numerous in the wash. Citellus leucurus — Scarce and very