94 



BULLETIN 144, UNITED STATES NATIONAL MUSEUM 



Distribution. — Southern end of the Lower California peninsula. 

 (See map 4, p. 87.) 



Diagnosis. — Size minimum for the species; forearm usually less 

 than 40 mm.; gieatest length of skull 14.2 to 15.6 mm.; color pallid. 



Color. — Two color phases are exhibited in the original series : One 

 duller, the other more intense; the duller specimens are not dis- 

 tinguishable except by size from dull specimens of the large Myotis 

 velifer incautus, but the brighter-colored individuals are more red- 

 dish above, approaching " clay color." 



Skidl and teeth. — Except for their smaller size, the skull and teeth 

 are counterparts of those of typical Myotis velifer. 



Masureinents. — For measurements see tables, pages 95 and 97. 



^Specinnens examined. — Total number 25, from the following 

 localities : 



LOWER CALIFORNIA: La Paz, 1 ale. (U.S.N.M.) ; Miraflores, 5 skins 

 (A. M. N. H.) ; San Jos6 del Cabo, 5 skins (B. M.), 5 skins (U.S.N.M.) ; 

 Santa Anita, 3 ale. (U.S.N.M.) ; Santiago, 6 skins (C. A.). 



Remarks. — It was supposed at first that " the extremely short tail 

 of the new species," Myotis peninsularis, was "its most strongly 

 marked character," as seemed to be indicated by the collector's flesh 

 measurements. But this apparent peculiarity was doubtless due to 

 some peculiar way of measuring, for in alcoholic specimens of the 

 animal no such feature appears (ratio of tail to head and body in 4 

 specimens in alcohol 82.2, as compared with 81.9 in 10 from Vera 

 Cruz and 79.9 in 10 from Arizona). 



One skin in the original series (93553 U.S.N.M.) is albinistic with 

 a considerable sprinkling of white hairs on the nape and especially 

 on the lower back and the sides, where a noticeable patch of white 

 is seen just behind each shoulder. 



External measurements of Myotis velifer 



