JESimpson 1938 Peromyscus eremicus 2650 ft., La Misión, 2 mi. W Magdalena, Sonora March 17, 1938 Seven taken in mousetraps on rocky hill, in rocky arroyo, and in rock-sand wash. One was a juvenile; several badly eaten at ears, mouth, and feet by ants. [illegible] of the seven put up as study-skins: ⚠38, ⚠39, ⚠40. March 18, 1938 Twelve taken in mousetraps (8♿; 4⚠) on rocky hillsides and saguaro "forest"; none put up. 775+ ft., Tinajas de los Papagos, Sierra Pinacate, Sonora March 22, 1938 Four in mousetraps on rocky hills [illegible] and level, lava field, adjacent; two were very dark like the dark pocket mice. Three ➷♿; one ⚠emb; none as study skins. March 23, 1938 Two in mousetraps in level dark lava field near the edge of the Papagotank's wash (2♿; not put up). Both were lighter than the dark ones from far out in lava fields. 850+ ft., Pas McDougal, Pinacate Region, Sonora. March 25, 1938 In mazonite and granite on east face of Sierra Hornaday caught ♿: 5♿➷ + 2 ⚠emb; put up two: ⚠69, ➷70. 900+ ft., ½ mi. S. Crater Elegante, 34 mi. W. Sonoita, Sonora March 27, 1938 ♿1x (4♿ + 2⚠; no emb.; put up ⚠80, ♿81, ♿82, ⚠83); in small wash.