Quart 1948 Journal 129 June 20 San Jorge, 5° ft, 25°44'N, 112°05'W, Baja California merriami, 1 ? Perognathus baylei, and 4♂+4♀ Perognathus arenarius. Murray, trapping in the same area, caught 1 Dipodomys agilis in addition to the other species. Dr. Benson caught 1 Canis latrans in a steel trail-set last night. June 21 same location Minimum temperature last night was 60°F, maximum was 77° today. Set 50 Museum special traps in bog by mangrove at north end of estero last night, and caught 3♂+1♀in♂Peromyscus maniculatus. None of this species was caught in the bog proper but rather along the "Mangle Dulce" and Mangroves. 50 live traps were set on dry ground along line of "Manglo- Dulce" in the same area and caught 3 Perognathus arenarius. The line of "Mangl Dulce" referred to spilled the Peromyscus manicula on its left, in wet soil and the Perognathus arenarius on its right on the dry soil. Dr. Benson caught 2 Canis latrans in trail set at point where bog, mangrove, and line of "Manglo Dulce" meet. The flat has many well-worn Coyote trail on it and dey were heard howling last night for the first time ever. Tevis caught one Perognathus baylei on the flat at the north end of the estero with