NO. 26 MAMMALS FROM CANADIAN ROCKIES HOLLISTER 3 



past the middle of body. Shoulders and upper part of fore legs 

 suffused with blackish. Hind legs dark brown outside to heel. Tail 

 above black and buff mixed ; below with central area clear cinnamon, 

 border black and cinnamon-buff. Sides and underparts of body 

 buffy-white, strongly suffused with darker buff. 



Skull and teeth. — Skull averaging- larger than that of C. I. ciner- 

 ascens, with slightly larger teeth. 



Measurements. — Type : Head and body, 198 mm. ; tail vertebra, 

 105 ; hind foot, 45. Average of nineteen specimens from type region 

 compared with average of fifteen specimens of cinerascens from Mon- 

 tana, the latter in parentheses : Head and body, 194 ( 178) ; tail verte- 

 brae, 104 (95) ; hind foot, 43 (40.9). Skull of type: Greatest length, 

 47; condylobasal length, 44; zygomatic breadth, 29.4; nasals, 15.5; 

 upper tooth row, 9.0. 



Remarks. — Twenty-seven specimens of this new form were col- 

 lected, twelve at the type locality, and fifteen at nearby points across 

 the line in British Columbia. 



MYOTIS ALTIFRONS, sp. nov. 



Type from Henry House, Alberta, at 3350 ft. altitude. Cat. No. 

 174133, U. S. National Museum; skin and skull, adult male (teeth 

 considerably worn). Collected September 5, 1911. J. H. Riley; 

 original No. 2317. 



General charaetcrs.—Ahout the size of Myotis Incifitgus, but differ- 

 ing widely in color and cranial characters. Upperparts very dark 

 brown ; forearm shorter than in M. liicifugns longicrus, longer than 

 in M. yiimanensis saturatns; border of interfemoral membrane with- 

 out trace of fringe ; wing from base of toes ; tragus long and narrow. 

 Skull with unusually inflated braincase, giving the effect of a turned 

 up nose much as in M. eapitaneus from Lower California. 



Color of type. —Upperparts very dark brown ; the underfur dull 

 black, and hair tips brown ; a thin border of clear burnt umber hairs 

 between hips, around base of interfemoral membrane. Underparts 

 dark drab-brown. Ears and membranes blackish. 



Skull and teeth.—SkuW about the size of skulls of M. I. longicrus: 

 facial concavity greater ; braincase higher, the inflation of the anterior 

 portion making it appear verv much larger, compared with rostrum, 

 than in lucifugus or any of its forms. The teeth in the type speci- 

 men are much worn, but appear to be essentially as in longicrus. 



Measurements of type.— Uesid and body, 49 mm. ; tail vertebrae, 

 ■ 39.5 ; hind foot. 9.5 (measured in flesh by collector) ; forearm, 36.5 ; 



