148 BULLETIN 144, UNITED STATES NATIONAL MUSEUM 



Cranial measurements of Myotis volans — Continued 



> Type. 



MYOTIS CALIFORNICUS (Andubon and Bachman) 



(Synonymy under subspecies) 



Distribution. — Warmer parts of western North America from the 

 coast of southern Alaska south to the southern part of the Mexican 

 highlands (Oaxaca) ; eastward it extends across the Great Basin to 

 Utah and central Colorado. 



Diagnosis. — Size small ; forearm 29 to 36.2 mm. ; total length about 

 85 mm., of which the tail usually forms somewhat less than one-half 

 (ratio of tail to head and body in series of specimens averaging from 

 91 to 98) ; greatest length of skull ranging from 12.4 to 14.2 mm.; 

 maxillary tooth row ranging from 4.8 to 5.4 mm.; lower tooth row 

 (excluding incisors) usually less than 5.4 mm. (5.0 to 5.8 mm.). Ear 

 exceeding the muzzle when laid forward. Metacarpals 3 to 5 slightly 

 graduated, the fifth about or quite reaching the elbow when wing is 

 folded. Foot small, slender, relatively shorter than in any other 

 American member of the genus except Myotis volans and M. subu- 

 latus, the ratio of its length to that of tibia usually ranging from 

 about 43 to 46, and occasionally falling as low as 37 ; calcar distinctly 

 keeled. Pelage full and long but without noticeable gloss, the color 

 of the bases of the hairs strongly contrasting with that of their tips 

 on the dorsal surface. 



Ear. — The ear is proportionally large (12 mm. in height) when 

 laid forward exceeding the tip of nose by 1 to 3 mm. ; the anterior 

 margin gentlj'^ convex, the tip slightly narrowed by a shallow notch 



