Perognathus parvus July 15 1 mi. NE Maryhill, ft. Klickitat Co., Washington Caught one specimen on the table land where it rises to the highest point above the Columbia river. The individual was trapped along the edge of an old alfalfa field which had grown up with weeds. There was abundant sign but apparently some of this was old. July 17 4 mi. NE Roosevelt, 200 ft. Klickitat Co., Wash. Camped and set traps at this locality last night with the hopes of getting Dipodomys ordii and some Perognathus. Of these two, Perognathus only were caught, but in very large numbers by all members setting traps. Most of the specimen were juvenile or young adults. The country is the low flat dry river bottom of the Columbia, and is grown up with Artemisia, Pursh's, cheat grass, etc., and a very few willows. July 18 Paterson, 250 ft. Benton Co., Wash. Set several along the edge of a freshly mown alfalfa patch here and carried one specimen. Others of the party who set traps in the sand dunes and drier uncultivated areas got a much higher percentage catch of this species. It is apparently abundant here.