Hoffmester 1939 Perognathus parvus July 25 5 1/2 mi. N Pasco, 500 ft., Franklin Co., Wash. Set traps north of the Snake River at this locality in Artemisia, cheat grass, and juniper shrub, with a sandy soil, and caught a large number of Perognathus parvus, most of which were subadults, rather than the most being juveniles as in previous trapping were considerable were caught at this time of year. This may indicate that at this locality which is more northerly and easterly than the other localities I've caught Perognathus parvus in large series, the breeding season is earlier.