278 



CHIROPTERA 



and near base ; anterior basal margin of ear with a narrow 

 outward-folded hem, the exposed side of which is densely 

 pubescent except at extreme anterior margin, where it is glabrous 

 and set with about six terete wart-like projections, widely and 

 irregularly spaced ; posterior basal margin with a shorter, deeper, 

 inwardly-folded lobe just above concavity limiting posterior 

 base of antitragus ; keel well developed, not thickened at edge, 

 its height posteriorly equal to about one-third its length, the 

 margin of keel hairy, the line thus begun curving upward and 

 backward under upper margin of conch ; antitragus well defined, 

 its height slightly greater than that of keel, its length about 

 twice height, its anterior border with ridge-like continuation 

 forward to corner of mouth ; tragus squarish in outline, its 

 posterior border longest and with distinct angle below middle, its 

 anterior border shortest, its upper border almost horizontally 

 truncate ; anterior and upper margin of tragus fringed with long 

 loose hairs. Wings longer and narrower than in any other 

 European bat, the membrane inserted on side of tibia just above 

 ankle ; antebrachial membrane extending as a narrow fold along 

 forearm to base of thumb ; the fur of body extends on both 

 surfaces of wing to line joining middle of humerus with knee, 

 and on to extreme base of uropatagium ; otherwise the membranes 

 are essentially naked except for some fine dense pubescence on 

 upper side of propatagium. Thumb short and robust, with 

 moderately developed pad at distal end of metacarpal. Foot 

 broad and robust, more than half as long as tibia, the sole with 

 a low and rounded but evident pad at middle, four small elongated 

 pads in a row at bases of toes, and some smaller, less definite 

 callosities in space between this row and the large median pad. 

 Outer and inner toe thickened, their outer surfaces densely 

 covered with short stiffened hairs with recurved points ; sprinkled 

 among these shorter hairs and also at the ends of the other toes 

 are a few much longer bristles. Calcar about as long as tibia, 

 its point ill-defined ; no indication of keel or of terminal lobe. 

 Tail about half as long as head and body, robust and muscular, 

 the terminal third or half projecting beyond membrane. 



Fur and colour. — The fur is everywhere dense and velvety 

 in texture, the hairs at middle of back about 7 mm. in length, 

 those on throat longer and looser. Colour a uniform light drab, 

 with faint darker shading in certain lights, the hairs pale ecru- 

 drab at extreme base. Ears and membranes in dry specimens 

 blackish. Fringes on feet and hairy lines on ears, drab like 

 body. 



Skull. — The skull is large, but rather slender, about equal to 

 that of Myotis myotis in length. In general form it is distinguish- 

 able among those of the bats of Europe by the depressed brain- 

 case, the high, somewhat tubular rostro-interorbital portion, and 

 the conspicuously emarginate inner side of auditory bullae. Dorsal 

 profile essentially straight from nares to lambda, though with a 



