Gilmore 1926 El Cayon Canyon, 3700 ft. E.base San Pedro Martir Mts. Lower California, Mexico. May 16. Sunday. 39 traps caught 1♀♂ 1♂ Perognathus 1♂ Peromyscus 222. Neotoma ♂ 17.1 G. 318-143-33-29 Caught under tuma cactus among rocks. 223. Peromyscus ♂ 19.5 G. 185-97-18-20 Caught under mesquite tree near creek. 224. Perognathus ♀ 23.8 G. 201-116-21-5 Caught among rocks at base of hillside. 225. Peromyscus ♂ 16.8 G. 976-91-18-21 Caught among rocks near creek. √ 226. Lizard Day catch on trapline under rock. Went down to the head of the canyon in the morning, a distance of about 2½ miles from camp. The canyon was steep and narrow all the way. The white winged doves grew more abundant towards the mouth and desert jims were found within easy distance of the mouth. The broods of S.C. vollicola were much more advanced than those around camp. Saw some antelope signs around the creek at the canyon's mouth. The creek dries up as soon as it reaches the sand. Saw the recent remains of a mountain sheep in one place. The coyote signs were also numerous.