264 



CHIROPTERA 



west to England, north to southern Norway and Sweden, east 

 into Asia. 



Diagnosis. — Characters as in the genus ; foi'earm about 38 

 to 40 mm. 



External cliaraders. — General form slender and delicate, the 

 legs long, the tail about equal to head and body. Muzzle short 

 and broad, its width considerably greater than distance from tip 

 of snout to joining membrane of ears, each side with a very large 

 glandular mass rising above level of flat median dorsal surface 

 and extending downward to involve most of iipper lip behind 

 nosti'il pad ; glandular masses densely hairy in noticeable contrast 

 with the finely pubescent nostril pad and essentially naked 

 median region between nostrils and inner bases of ears ; nostrils 

 crescentic in outline, opening upward, somewhat crowded between 

 glandular lateral masses ; nostril pad well defined, rounded off" 

 above, continued downward into median portion of upper lip, the 

 edge of which, between glandular masses and separated from 

 them by evident grooves, is distinctly convex, fitting like a 

 valve, when mouth is closed, over bare median callosity of lower 

 lip. Ear large and broad, though not specially elongated, the 

 tijj extending about 5 mm. beyond nostril when laid forward ; 

 antei'ior basal lobe very small, appearing like a rudimentary 

 Molossine keel, the portion of anterior border usually reflexed in 

 Vespertilionine bats thrown forward so that its base joins its fellow 

 of opposite ear, the region of juncture low but sufficiently well 

 developed to form a distinct pocket on side next forehead ; out- 

 line of anterior border strongly convex excejit for an evident 

 flattening just below the rather abruptly rounded off" and some- 

 what recui'ved tip ; posterior border abruptly concave above, then 

 nearly straight except foi' an abruptly projecting lobe near 

 middle (lobe usually about 1 ' 5 mm. long "by 1 mm. wide, its uppei- 

 border convex, its lower border concave) ; lower border of ear full 

 and rounded, but with no dift"erentiated antiti'agus ; tragus large, 

 somewhat ti-iangular in outline, its greatest width (slightly above 

 level of anterior base) equal to about two-thirds length of anterior 

 border, its up^ier jjortion I'apidly narrowing to an attenuate tip ; 

 meatus with well developed keel-like ridge ; outer surface of ear 

 densely furred except at extreme tip and along posterior border 

 to a little below level of projecting lobe ; inner surface with a 

 hairy line marking juncture of anterior border of conch with 

 portion usually folded backward, elsewhere irregularly sprinkled 

 with fine hairs. Membranes thin and delicate, the wing broad, 

 inserted at base of outer toe, the antebrachial membrane con- 

 tinued outward as a very narrow fold to base of thumb ; third 

 metacarpal slightly shorter than forearm and a little exceeding 

 the sub-equal fourth and fifth ; fur soft and loose, the hairs on 

 middle of back about 10 mm. in length ; on both ui:)per and 

 under surface of wing the fur extends to a line joining middle of 

 forearm with knee ; foot less than half as long as tibia ; calcar 



