El Cayon Canyon, 3200 ft., E. base San Pedro Martin Mts Lower California, Mexico. Gilmore May 29, 1946. 60 traps and 6 steel settings caught 1 Bat Citellus 336. Bat ? 4.3 G. 74-28-6-9 Killed while flying over camp. 337. T. fuscus semicula ? (juv.) 35.9 G. Killed while sitting on a mesquite tree in a narrow side canyon leading up into the mountains. 338. L.c. vallicola ? (juv.) 75.9 G. Killed near in canyon filled with mesquite etc & grass. 339. L.c. vallicola B (juv.) 48.2G. Same as above. 340. T.nitens (?) (juv.) 18.9 G. Same as above. 341. M.c. cinerascens ? 67.7 G. Killed from estillo limb near main creek. 342. L.c. vallicola F (juv.) 47.5 G. Killed in mesquite bush in canyon with plenty of grass & creek 343. Lizard Shot on sand beach next to stream. 344. Snake Caught in rat trap set under mesquite on rocky flat. Walked over the top of one of the high ridges near camp. On the top I saw some M.c. cinerascens, T.c. obscura, Catherpes mexicanus conspersus, D.s. cactophilus, A. A.b. deserticola and Ammopermophillus. The sides of the ridge were very steep and rocky but on top was a small meadow where there was loose sand & a few trees.