i62 VESPERTILIONIDvE— MYOTIS 



The forehead is elevated, the occiput prominent, the muzzle pointed, 

 the nostril moderately tumid (Plate XI., Fig. i, p. 140). 



The ear (Fig. 2, No. 6, p. 7), when laid forward, reaches well beyond 

 the tip of the nose ; the outer margin is rather deeply notched, the upper 

 half being deeply concave, with wavy outline, the lower half abruptly 

 convex ; a slight emargination opposite the base of the tragus gives rise 

 to a small but distinct basal lobe ; the inner margin is convex through- 

 out its length to the rounded tip ; at its base it bends inwards almost 

 at right angles to its former course ; there are four to six cross-folds. 



The tragus (Fig. 2, No. 6, p. 7), which is broadest at a point opposite 

 about one quarter of the height of the inner margin, is straight, does 

 not curve outwards, and tapers to a point at slightly more than half the 

 height of the ear ; the inner margin is straight, the outer margin roughly 

 triangular, with a small rounded basal lobe surmounted by a concavity. 



The wing (Plate XIII., Fig. i,p. 174) arises from the base of the toes, 

 and, the third and fifth metacarpals being more nearly of equal length, is 

 broader than that of AT. daiibentoni. The relations of the lower leg and 

 foot are remarkably different, the length of the latter being only about half 

 that of the formier as against nine-sixteenths in M. dmibentoni. Rela- 

 tively to the forearm the lower leg is longer than in any other bat already 

 described, and creates a large interfemoral membrane. The calcar is 

 small, extends along the free border of the interfemoral only about half- 

 way from foot to tail, and does not terminate in a noticeable projection. 



The fur is long and thick, burying the eyes, covering the face to the 

 upper lips, and giving it a short, thick appearance ; the lips are fringed 

 with a moustache of bristles, and there are a few on the chin and a row 

 across the forehead. On the wing, above and below, the fur extends to 

 a line connecting the central points of humerus and femur, and on the 

 interfemoral membrane to the end of the third caudal vertebra above 

 and to the root of the tail beneath. The ear is very sparsely haired. 



The colour is somewhat variable, but the most frequent type is 

 probably that having the upper surface somewhere between or near 

 grizzled " raw umber " and " wood brown," the lower surface lighter and 

 nearer dirty white. These colours are those of the tips of the hairs, the 

 bases being everywhere dusky. The line of demarcation is not abrupt, 

 and runs approximately from the angle of the mouth to and along the 

 line of attachment of wing and body. The face and chin are often 

 dusky, in contrast to the brownish forehead and whitish throat, and 

 there may be conspicuous patches of dusky hairs at the inset of the 

 arms, a pattern which no doubt suggested the technical names colaris 

 and humeralis. 



The bare skin of the muzzle, face, nose, lips, ear, and limbs, is silky 

 black, the wing and tail brownish black ; the nails dusky with paler tips. 



The young are darker above and lighter below ; but old females, 



