458 Mammals examined from Idaho in the Chas. P. Connor mus., Pullman, Wash. Myotis leialascensis (Identified by G.S. Miller). 818 Felton's Mills, 11 mi. ENE Morrow; coll. July 3, 1923 by U.T. Shaw; 90-37-11. No skull. Skin in fair condition, as compared with Myotis L. carissima from Elba, this specimen is darker dorsally; forearm = 36 mm.; trague) is about same size; much darker ventrally- no indication of whitch; much larger in total length. Skull broken, the identifiable. Thomomys fusceus fusceus .(?) ad. 2598 Lewiston - coll. Oct. 7, 1922 by W.T. Shaw, ? M. Tardy, 184-60-28. (Identified by Vernon Bailey). Occipital region of skull missing; skull poorly cleaned. Cranial measurements: Interorbital, 6.7; nasals, 11.3; rostrum, 14.3; maxillary tooth row, 7.3; middle claw of front foot, 9.5 As compared with topotype of fusceus the following differences are noted: 1. Interorbital breadth greater. 2. Nasals shorter. 3. Incisors less recurved, that is more prominent and project noticeably beyond end of nasals. 4. Premaxillary tongue) projects 2 mm. beyond nasals; not ending flush with them or nearly so. 5. Rostrum narrower - 6.5 as to 7.0. 6. Angle of coronoid with dentary sides the