172 BULLETIN 144, UNITED STATES NATIONAL. MUSEUM 



Type locality. — Erie County, Ohio. 



Type specimen. — Collected in Erie County, Ohio (formerly Michi- 

 gan), by Dr. George C. Leib, and sent to Audubon and Bachman at 

 Philadelphia, but not now known to be in existence. 



Distribution. — From Vermont, New York, and Ohio south to West 

 Virginia and Kentucky; exact limits of range not yet ascertained. 

 (See map 12, p. 165.) 



The few specimens at hand probably indicate fairly well the gen- 

 eral range, though the southern limits will doubtless be found to 

 extend to Florida. Intergradation with the pale race of the Plains 

 country probably takes place west of the Mississippi. 



Diagnosis. — General color much darker than in the typical sub- 

 species and closely resembling that of Myotis Jucifugus lucifugus 

 in the olive phase, but slightly more golden above and lacking the 

 dark spot at the shoulder. 



Color. — Upper surface of body, from forehead to base of tail, 

 nearly " ochraceous tawny " with a golden sheen in some lights due 

 to the shining tips of the long hairs ; on the sides of the neck the tint 

 is a little brighter. Lower surface " warm buff," the tips of the hairs 

 slightly burnished. Bases of the hairs on the body everywhere 

 blackish, except at the extreme sides. The face from the nose to base 

 of ears and including the lower lip, black, giving a masked appear- 

 ance, which is heightened by the dull black ears, tragus, nose and 

 chin. Wings and membranes blackish brown. 



Skull. — Although nearly as long as that of Myotis lucifugus.^ the 

 skull is so flattened that it has a notably less depth ; the brain case is 

 distinctly narrower. 



Measurements. — For measurements see tables, pages 173 and 174. 



SpeciTiiens exartiined. — Total number 8, from the following 

 localities : 



KENTUCKY: Hickman's Cave, 1 ale. (M. C. Z.). 



MARYLAND: Plummer Island, 2 skins (U.S.N.M.). 



NEW YORK: Sing Sing, 2 ale. (U.S.N.M.). 



WEST VIRGINIA: White Sulphur Springs, 1 skin (M. C. Z.). 



VERMONT: Brandon. 1 skin (U.S.N.M.) ; Proctor, 1 skin (U.S.N.M.). 



Remarks. — This smallest of the bats known to occur in the eastern 

 United States seems to be much less common than Myotis lucifugus 

 lucifugus, and the few specimens that have been taken have usually 

 been confused with the better known animal. Its black ears and facial 

 mask, rather golden tint, keeled calcar and shorter forearm (31 to 34- 

 mm. instead of 36 to 40 mm.) will at once distinguish it, however. 

 Though described by Audubon and Bachman eighty years ago, it 

 was not again recognized until Nelson redescribed it in 1913 as 

 Myotis winnennana. 



