In connection with this study the authors acknowledge the assistance of Drs. Edson H. Fichter, Department of Biological Sciences, Idaho State College, and E. Raymond Hall and Rollin H. Baker, University of Kansas Museum of Natural History for critical assistance with the manuscript. We are indebted to Mr. Richard B. Loomis, University of Kansas, for aid in collecting specimens; to Dr. Henry W. Setzer, United States National Museum, for providing information on possible early Nebraskan records; and to Mr. Fred Brammer, Ash Grove Lime and Portland Cement Company, Louisville, Nebraska, for information on, and permission to collect in, the quarries of that area. For the loan of specimens we are grateful to Dr. William H. Burt, University of Michigan Museum of Zoology, Dr. C. Bertrand Schultz, University of Nebraska State Museum, Dr. Otis Wade, University of Nebraska Department of Zoology, Miss Lucille Drury, Cleveland Museum of Natural History, Mr. W. E. Eigsti, Hastings Museum, Hastings, Nebraska, and to those in charge of the collections of the Nebraska Game, Forestation and Parks Commission. ACCOUNTS OF SPECIES ~Myotis evotis evotis~ (H. Allen) Long-eared Myotis _Vespertilio evotis_ H. Allen, Smithsonian Misc. Coll., 165:48, June, 1864 (part), type from Monterey, Monterey Co., California. _Myotis evotis_, Miller, N. Amer. Fauna, 13:78, October 16, 1897. _Distribution in Nebraska._--Pine Ridge area of northwestern part of state. _Record of occurrence._--Specimen examined, 1, as follows: SIOUX CO.: Warbonnet Canyon, 1 (Univ. Nebr. State Mus.). _Remarks._--This specimen was taken by Merritt Cary on July 22, 1901. ~Myotis keenii septentrionalis~ (Trouessart) Eastern Long-eared Myotis [_Vespertilio gryphus_] var. _septentrionalis_ Trouessart, Catal. Mamm. viv. foss., p. 131, 1897, type from Halifax, Halifax Co., Nova Scotia. _Myotis keenii septentrionalis_, Miller and Allen, Bull. U. S. Nat. Mus., 144:105, May 25, 1928. _Distribution in Nebraska._--Known from limestone quarries in Cass and Sarpy counties. Probably in other parts of extreme eastern Nebraska. _Records of occurrence._--Specimens examined, 35, as follows: CASS CO.: 1 mi. NE Louisville, 4. SARPY CO.: 1/2 mi. W Meadow, 31 (some of these specimens have been deposited in other collections as follows: Private Collection of P. H. Krutzsch, 3; Private Collection of W. G. Frum, 2; Nebr. Game, Forestation and Parks Comm., 1; Univ. Kansas Mus. Nat. Hist., 2; Univ. Nebr. State Mus., 7).