Perognathus parvus June 29 Crooked R., 3400 ft., at mouth of Bear Cr., Crooke Co., Ore. Caught 6 of this species last night on the juniper studied slopes of the small hills at this locality. This genus was nearly as abundant as Peromyscus maniculatus, catching 6 of the former; 7 of the latter. The pocket mice were caught in the barren ground beneath junipers, in rock piles, and in open slopes. June 30 Crooked R., 3100 ft., 4 mi. W mouth of Bear Cr., Crooke Co., Ore. Set traps last night in the extensive basaltic slides that line the walls of the gorge of the Crooked river at this point, with the especial hopes of catching Peromyscus erinitus. However, these traps in these cliffs and slides had chiefly Perognathus. Some of these mice were trapped out on the slides with no vegetation within 20 feet, and there only a small amount with visible Perognathus burrows. July 4 Columbia R., 300 ft., at mouth of Deschutes R., Wasco Co., Ore. Caught one specimen in the fine sand along the railroad right-away. Pocket mice are not overly abundant in this dry area which should support numerous Perognathus. There is an abundance of Artemisia and cheat grass, (which are in the greatest abundance).