A MONOGKAPII OF THE BATS OF NOKTH AMERICA. 81 



List of 8j)i'eimenx. 



Locality. 



Nova Scotia 



do 



Halifax, Nova Scotia. 



do 



do 



BavsHeld, Wis 



Wi'mhIh Hull, Mass ... 

 West I'oiut, N. Y 



Collection. 



U. S. Nat. Mu8. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 



Two specimens of bats have been examined from the far north. One 

 of these is No. 11100 oST. M., llupert House, Hudson Bay. Immature. 

 The furls dark brown. The tragus is small. The other is ^o. 11189 

 N. M., Alaska. The ear is large, tlie tragus is subulate, and the 

 proportions generally quite as in the southern forms. The fur is 

 dark brown. The specimen is in very poor condition. It is placed 

 provisionally with V. gryphus. It is nearer tlie gryphian than the 

 nitidian forms, but can not be included in any of the above varieties. 

 The ease with which the bats from British America can descend along 

 lines of high elevation into the northwestern part of the United States 

 renders it i^robaby true that a mingling here of eastern and western 

 forms take place. At all events I lind it sometimes impossible to iden- 

 tify many specimens collected in Alaska, the western coast of British 

 America, western Washington, and Oregon. 



A specimen wliich I have recently received from Dr. Merriam, ob- 

 tained from Princess Charlotte Islands, belongs to the same category. 



Mimhrancs. — The predigital nerve in tiie fourth interspace appears' 

 from tlie side of the fifth metacarpal bone at about its middle and is 

 larger than a postdigital opposite which it appears at the side of the 

 fourth metacarpal. The transverse lines in the interfemoral membrane 

 are nearer to each other near the base than elsewhere. 



The muscular mass of the base of the fifth metacarpal bone (com- 

 posed of the flexor minimi digit i and the interosseouH) equals one-sixth 

 the length of the bone. The metacarpal bones more distinctly defined 

 on the dorsum than venter; the ventral aspect of the fourth meta('ari)al 

 bone is the least distinct of any, owing to the fact that it is crossed by 

 numerous minute fibers. 



MaxiUary ferfh. — The maxillary central incisor caninifoim, slightly 

 larger than the lateral, and (owing to a high degree of Jevehqnnent of 

 the cingulum) is marked bifid at cutting edge. The lateral border of 

 l)alatal surface with a basal cusp. Lateral incisor with a main conical 

 crown, which is somewhat wavy in contour posteriorly. Cingulum low 

 and broad on the posterior and lateral borders, but crenulated and 

 disposed obliquely forward and upward to the median border of the 

 tooth, nearly reaching the level of the main cusp- tip. The variable 

 411—^^0. lo 



