Some Notes on the Mammals of Mammoth Cave, Ky. 59 



Description. The status of this mouse is so well under- 

 stood that it is not necessary to more than briefly allude to its 

 several characters. As exemplified in the specimens above 

 mentioned, the Deer Mouse of Central Kentucky may be con- 

 cisely stated as a miniature of the Cave Rat — something over 

 6 inches long. In color, pattern and proportions it is the 

 exact counterpart of the rat, but in color the dark, buffy gray 

 of upper parts of that animal is a delicate, grayish fawn in the 

 adult mouse. The specimen sent by Professor Call is an im- 

 miture individual about two-thirds grown, and is in the lead- 

 colored dress so characteristic of the young of this genus. 

 The adults are above the average size of this species, and ap- 

 pear more lightly colored than eastern specimens of leucopus, 

 but the skull and feet fix their identity with that species. 

 The male measures 174 mm. in total length, the tail vertebrae 

 70, and the hind foot 21. The female is longer by 10 mm., 

 owing largely to the greater length of tail, but its feet are of 

 the same length as in the male. 



Little Brown Bat. Vespertilio lucifugus I^e Conte. 



Vespertilio lucifugus Le C. Cuv. An. Kingd., 1831, appx. I,- p. 431. 

 Vespertilio gryphus Fr. Cuv. Nouv. Ann. du Mus., 1832, p. 15. 

 H. Allen, Mon. Bats N. Amer., Bull. U. S. Nat. Mus., 1893, p. 75. 



Geographic distribution. Northern North America, from 

 the Barren Grounds south to the Sonoran and L,ouisianian 

 regions. 



Habitat. Hollow trees, caves, and buildings by day, flying 

 abroad at night in search of food. 



Habits. This is, by far, the most common form of bat found in 

 Mammoth Cave — indeed, more than 90 per cent of those I saw 

 appeared to be of this species. In the " Bat Chamber," during 

 the list week in April, there were at least two thousand at 

 one time. They seemed to prefer the higher ledges of the 

 dome, hanging in long, interrupted, single or triple rows, or 

 in other places, covering irregular patches so thickly as to 

 blacken the walls. Among them appeared to be a larger spe- 

 cies, which looked like Adelonycteris fusca, but no specimens 

 of these have come to hand. In a low, wide passageway (Lit- 

 tle Bat Avenue), about one-fourth of a mile from the entrance 



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