Murray 1948 3 Perognathus spinatus May 5 Bahía Concepción, 50± ft., Baja Calif. - 13 mi SE Mulegé Had out 50 museum special mouse traps on a hillside of brown volcanic rock, some large covering it densely. There was some ocotillo, copal, creosote with other thorny bushes. The line crossed two draws. Caught 2 ♂ 4 ♀ and 1 discarded, most of the catch being down in the draws. Also got 5 Peromyscus eremicus and 2 Neotoma lepida. The interval between traps was about 50 ft. May 6 Same location This time put out 50 live traps in almost the same place, but running up both sides of the large draw. The terrain was the same, save having denser vegetation. Took 4 ♂ 4 ♀, with the catch very predominantly on the [west] slope where the line was a little deeper in the canyon. (running N-S) There were also 4 Peromyscus eremicus. May 7 Same location, sea level. Put the traps in a variety of locations: 15 along the base of the cliffs by the road and in salicornia which caught 2; 5 in salt marsh with more Salicornia caught 1 though within 30 ft. of rocks. 15 in an area of shell fragments extending up the hillside into the rocks caught 1, 15 more