54 BULLETIN 144, UNITED STATES NATIONAL MUSEUM 



Whitney, California, though very pale in general coloration, is refer- 

 able to ca7issivm. 



Diagnosis. — In general like Myotis lucifugus carissima but color of 

 fur even more pallid and ears light brown instead of blackish. 



Descrij)tion. — Very pallid, the general effect above a uniform pale 

 buff with a pronounced pinkish cast and a faint golden gloss ; below 

 buffy white. In detail: the fur of the body is everywhere dark 

 plumbeous at the base, that of the back with a narrow ring of 

 " ochraceous-buff " and a " light-buff " glossy tip. The ochraceous- 

 buff ring showing through the paler glossy tips produces the pinkish 

 tint. The edges of the ears and their bases exteriorly are clothed 

 with short hair, pale " ochraceous-buff " throughout. Short stiff 

 hairs about the upper lip between the eye and the muzzle are dusky 

 brown. The usual darker shoulder-spot is hardly apparent, but is 

 marked by an area of pale cinnamon. Ears and membranes pale 

 brownish (not blackish as in M. lucifugus carissitna) , the edge of 

 the interfemoral membrane, especially near the tip of the tail, and 

 the posterior rim of the wing membranes whitish. 



MeaMiretnents. — For measurements see tables, pages 58 and 61. 



Specimens exatiuTied. — In all 4, from the following localities: 



CALIFORNIA: Argus Mountains, Inyo County, 1 skin (F.M.). 

 COLORADO: Lily, Routt County, 1 skin (U.S.N.M.) ; Snake River, Routt 

 County, 2 skins (U.S.N.M.). 



Remarks. — The desert race phasma is the opposite extreme from 

 the saturate Myotis lucifugus alascensis of the moist Pacific coast. 

 Between the two is interposed the form carissima which, although 

 intermediate, is so constant in color over a wide area as to constitute 

 a subspecies with a definite geographic range. So closely does 

 Myotis lucifugus phnsma parallel typical M. yumanensis in color that 

 Gary (1911) very naturally considered his Colorado specimens as 

 belonging to that species. They are readily separated however, by 

 the longer glossy-tipped fur above, the longer forearm and wing- 

 bones, and by the larger skull with its less elevated brain case, 

 characters diagnostic of Myotis lucifugus. 



MYOTIS LUCIFUGUS FORTIDENS, new subspecies 



Type. — ^Adult female (in alcohol) No. 88.8.8.18, British Museum 

 (Natural History). Collected at Teapa, Tabasco, Mexico, by H. H. 

 Smith, January 5, 1888. Presented by Messrs. Salvin and Godman. 



Distribution. — From southern Mexico north to extreme western 

 Texas. 



At present only two specimens are known which can be referred to 

 this race. The exact limits of the range are therefore problematical. 



Diagnosis. — Size and color about as in Myotis lucifugus lucifugus; 

 skull with sagittal crest probably more frequently developed than in 



