Quest 1948 Perognathus formosus April 7 Punta San Felipe, 50± ft, Baja California Nos. 12,13,14. Two females and one male caught last night on hill 200 yds. west of camp. The live traps were set in the boulder-strewn water courses and on the intervening rises between them. All traps were set well up on the steep hillside at least 50 yds from the base of the hill. The Perognathus formosus were caught mainly on the flat ground on top of the rises, the traps in the water-courses yielding Peromyscus erimitis. A few spots with soil beneath Enoclia bushes were honeycombed with burrows, possibly of the formosus species. 8:45 P.M. ten mouse traps (museum special) set before dark caught three Perognathus formosus females. Traps set along trail leading west of camp in area between talus slope and sea shore. Area sand and rocks with Enoclia and Cereote. Two specimens put up - nos. 18+19. April 10 Five caught, 3♀ + 2♂, on rocky hillside east of camp at least 100 yards from desert association of sand, ocotillo and creosote. Other mammals caught in accompanying live traps were Perognathus spinatus and Peromyscus erinitis. April 12 9 mi W. Punta San Felipe, 200± ft, Baja California One caught on decomposed granite hillside with a Perognathus spinatus + a Perognathus erinitis #45. (50 traps set)