50 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



Plecotus sacrimontis, sp. nov. 



Plecotus auritus Peters, Monatsber. kbnigl. preuss. Akad., Berlin, 1880, p. 24 

 (part) ; Auct. 



Type. — Adult male, alcoholic, No. 6932, Museum of Comparative Zoology; col- 

 lected ou Mt. Fuji, Japan, 4 December, 1906, by Alan Owston, and presented by 

 Mr. Thomas Barbour. 



General Characters. — Resembling P. auritus of Europe, but larger, with a longer 

 and broader skull. The tibia and the thumb are noticeably longer than in P. 

 auritus, but the ears are of about the same size. 



Description of the Type. — Color, in alcohol, dorsally a uniform brown, nearest 

 to bistre of Ridgway, the bases of the hairs much darker ; veutrally the hairs are 

 slate color at the bases, broadly tipped with light smoke gray. 



The membranes are naked, but the very large ears are provided with a fringe of 

 short hairs on the basal two thirds of their inner margin and for an equal distance 

 aloucr the keel of the ear conch. There are also a few small scattered hairs at the 

 base of the ear externally, and on the inner face distally. A few stiff appressed 

 hairs cover the back of the foot. About two dozen transverse rugae are present 

 on the exterior two thirds of the ear. The very large tragus is similar to that of 

 P. auritus, and bears a few minute scattered hairs on its outer face. Wing mem- 

 brane from the base of the toes ; calcar loug and slender, without a keel, and ter- 

 minating iu a small but distinct lobe. The last caudal vertebra is free. 



Skull and Teeth. — The skull and teeth are larger throughout than in the Euro- 

 pean species; the difference in the length is rather more striking than that in 

 breadth. The cranial dimensions are given below. 



Measurements. — External measurements (for comparison, the corresponding 

 measurements of Plecotus auritus, from Europe, No. 3279, J 1 adult, are added 

 in parentheses after each): head and body, 42 (40); tail, 44 (45); ear, 39 (36); 

 tragus, 15.5 (15); forearm, 40 (39); thumb, 11.7 (7); 2d digit, metacarpal, 

 34 (32); 3d digit, metacarpal, 34.3 (35); 1st phalanx, 14.4 (14); 2d phalanx 

 and tip, 20.5 (18.5); 4th digit, metacarpal, 35 (34.2); 1st phalanx, 9.5 (9); 

 2d phalanx and tip, 10 (9) ; 5th digit, metacarpal, 33.4 (33) : 1st phalanx, 9.5 

 (9.3) ; 2d phalanx and tip, 10.5 (9.3) ; tibia, 21 (1S.8) ; foot, 10.6 (7) ; calcar, 

 12 (14.5). 



Skull: greatest length, 17.5 (16.2); basal length, 14 (13.3); palatal length, 

 8.2(7-3); interorbital constriction, 4 (3.7) ; zygomatic breadth, 9 (8.5); mastoid 

 breadth, 9 (S.6) ; mandible, 11.5 (10) ; maxillary tooth row (exclusive of incisors), 

 5.8 (5); mandibular tooth row (exclusive of incisors), 6 (5.5). 



Distribution. — So far as known this bat is confined to Japan. 



Remarks. — The longer and larger thumb (PI. 1, Fig. 5) of the Japanese 

 Plecotus, without corresponding appreciable increase of length in the other bones 

 of the hand, together with the larger foot, longer tibia, and bigger skull, at once 



