JESimpson, 1938 54. 200+ ft., 3 mi. n. Puerto de Lobos, Sonora. April 204, 1938, continued. Here set out 50 traps in sand at the edge of the lava among creosote and white brush and 50 live traps on sand dunes; also 7 rat-traps at edge of lava. April 22, 1938 Caught 2 Perognathus intermedius (♂ 221 was badly chewed up by red-and-black ants; ♀ 222: no emb.); (cheek-pouch contents saved), 6 Peromyscus eremicus (saved 2: ♂ 223; ♀ 224*), 4 Dipodomys merriami (♂ 225, 226; ♀ 227, 228; nothing but bait in cheek-pouches), 1 Neotoma albigula (♂ 229), and 2 Perognathus longimembris (♂ 230; ♀ 231; cheek pouches empty). The latter two taken in live-traps on sand dunes; the rest at edge of lava. Broke camp and drove back toward Caborca as there apparently is no road direct to Puerto Libertad; again got good water at Las Alesnas well — nine miles beyond making camp at: 900+ ft., 13 mi. sw. Caborca, Sonora April 22, 1938, continued. Set out 50 mousetraps and 60 live traps on the level, sandy soil supporting some grass & scrub-brush but dominately paloverde, creosote, and very large cholla. A few woodrat houses were seen under the larger trees, but we did not trap for them here. Dr. Benson reported having seen a deer but had no gun. (We now have permits for taking 2 deer, also 2 peccary; the