AMERICAN BATS OF THE GENERA MYOTIS AND PIZONYX 53 



:ance gives little clue to the natural color. Thomas says : " Color 

 above and below (in spirit) uniform smoky blackish, the tips of the 

 hairs indistinctly buffy or pale brown." This account applies suffi- 

 ciently well to the appearance of a dull colored individual seen in 

 alcohol, but it gives no idea of the color characteristic of the race. 

 For this reason, Mrs. H. W. Grinnell was misled into supposing that 

 the pale California bat was different from Myotis carismna. She 

 therefore renamed it altipetens on the basis of a specimen from 

 Yosemite Park, California. Specimens frequently occur with a well- 

 marked though narrow white edge along the posterior margin of the 

 wing membrane, and the terminal part of the interfemoral membrane 

 may also be more or less whitish. It was an extreme example of this 

 style that served for the type of M. alMciiwfus G. M. Allen, while the 

 type of altipetens H. W. Grinnell is similarly marked. Both are 

 uncjuestionably to be referred to the present subspecies. 



The specimen No. 32029, from Geyser Basin, Wyoming, already 

 mentioned (p. 8) on account of its abnormal teeth {p7n^ right absent, 

 p^n - and />m ^ left coalesced) is further peculiar in the general slen- 

 derness of its skull. It appears, however, to be referable to the pres- 

 ent form. 



MTOTIS LUCIFUGUS PHASMA. new subspecies 



Myotis yumanensis Caby, North Amer. Fauna, No. 33, p. 207, 1911 (not of H, 

 Allen, 1864).— Wabben, Mammals of Colorado, p. 273, 1912 (part). 



Type. — Adult female, skin and skull No. 148159 United States 

 National Museum (Biological Survey collection), collected at Snake 

 River, south of Sunny Peak, Routt County, Colorado, August 28, 

 1906, by Merritt Cary. Original number, 792. 



Distribution. — ^Arid portions of the Great Basin, Limits of range 

 not known. 



Presumably this race will be found to occupy all of the more arid 

 parts of the Great Basin, where no doubt it will prove to be of local 

 occurrence, depending on proper conditions. The Colorado localities 

 probably represent the extreme northeastern limits of its range in 

 the desert valleys of western Colorado (Upper Sonoran Zone). The 

 three secured by Cary were captured " in deserted ranch buildings 

 after nightfall, where they were not at all common, being greatly out- 

 numbered by M. evotis.''^ Its presence in southern Utah can not be 

 doubted, but no specimens are at hand. Two immature bats from the 

 Bear River in the northern part of the state, though still in dark 

 pelage, seem better referred to carissinia. A single specimen from 

 Inyo County, California, though in poor pelage, is, however, appar- 

 ently phasma.) thus carrying the range across to the Californian des- 

 erts. The type-specimen of M. alhicinctus G. M. Allen, from Mount 



