178 



CHIEOPTERA 



to rather acute tip. Wing as in the related species ; metacarpals 

 falling short of elbow by about 3 mm. ; membrane inserted at 

 base of outer toe. Calcar slender, its termination usually marked 

 by a distinct lobe, its length about equal to that of free border 

 of interfemoral membrane. Tail relatively shorter than in M. 

 mystacinus, extending to between ears when laid forward, only 

 the minute cartilaginous tip free from membrane. 



Fur and colour. — Fur shorter and more dense than in M. 

 mystacinus and M. nattereri, and of a slightly woolly texture 

 unique among the European species, the hairs at middle of back 

 about 8 mm. in length. Distribution of fur not peculiar ; free 

 border of uropatagium sometimes with evident fringe. General 

 colour buff, light and clear on underparts, dulled and irregularly 

 clouded by darker brownish hair tips throughout upper parts ; 

 basal half of hairs drab ; muzzle and cheeks dusky ; ears and 

 membranes an indefinite rather light brown. 



Skull. — In form the skull does not differ appreciably from 

 that of M. nattereri, except that the rostral portion and palate are 

 relatively more elongate and interorbital concavity is less strongly 

 pronounced ; occipital region similarly low as compared with that 

 of 31. mystacinus. Mandible slightly more robust than in M. 

 nattereri, but of similar form. 



Teeth. — The teeth are larger than those of Myotis mystacinus, 

 in this respect agreeing with those of M. nattereri. Upper 

 incisors higher and more slender than in the preceding species, 

 their crowns sub-equal in cross section ; lower incisors very 

 slightly imbricated, forming a broadly and evenly convex 

 (U-shaped) row without anterior angle, the crowns of i 1 and «, 

 alike in form and distinctly 4-cusped, that of i x not thickened 

 posteriorly and with no trace of postero-internal cusp. Canines 

 about equal to those of M. nattereri in size, but shaft of upper 

 tooth with evident postero-external longitudinal groove. First 

 and second upper premolars even more strongly contrasted in 

 size than those of M. mystacinus, the cusp of second only a httle 

 exceeding cingulum of first ; the two teeth less crowded between 

 canine and large premolar than in M. mystacinus and M. nattereri ; 

 lower premolars essentially as in 31. nattereri, but less closely 

 crowded, and second relatively larger. Upper molars as in 

 M. nattereri, but crowns less narrowed ; a rudimentary commissure 

 extending outward from base of hypocone and another extending 

 inward from base of paracone ; lower molars not peculiar. 



3Ieasurements. — Two adult females from Florence, Italy 

 head and body, 46' 6 and 50 ; tail, 40 and 42 ; tibia, 19 and 19 

 foot, 8 - 4 and 86; forearm, 40 and 41 ; thumb, 8 and 7 - 8 

 third finger, 67 and 70 ; fifth finger, 56 and 57 ; ear from meatus, 

 16 - 6 and 17 ; width of ear, 11 "4 and 12. For cranial measure- 

 ments see Table, p. 183. 



Specimens examined. — Six, from the following localities : — 

 Holland : Maastricht, 1 (U.S.N.M.). 



