﻿VESPERTILIO FUSCUS, 



97 



ears and membranes tliick and leathery 5 crowns of upper molars nar- 

 row; color variable, but seldoni very dark. 



Ears. — Ears short, reaching barely to nostril when laid forward, 

 furred on basal third above and sprinkled with hairs on most of inner 

 surface, but especially near an terior bor- ^ 

 der. The membrane of the ear is heavier 

 and more leathery than in the southern 

 subspecies, and the anterior edge is dis- 

 tinctly thickened. 



Memhr fines. — Membranes naked, broad 

 and ample, that of wings attached to 

 foot a little beyond base of toes. Free 

 edge of interfemoral membrane a little 

 shorter than calcar and terminatiug at 

 base of penultimate caudal vertebra. The 

 tlight membranes, like the ears, are 

 thicker and less membranaceous than in 

 the subpecies occurring in or near the 

 tropics. 



Feet. — Foot about half length of tibia; 

 calcar slightly longer than foot, keeled 



on outer 

 edge, and 

 terminat- 

 ing indis- 

 tinctly or 

 in a faintly 



dehned lobe. Dorsum of toe 

 few short bristle-like hairs. 



Fur and color. — On middle of back the 

 fur is about 12 mm. long. The fur ex- 

 tends along the sides in a line about 10 

 mm. wide on wing membranes both above 

 and below. The proximal third or fourth 

 of uropatagium is furred. Otherwise 

 the membranes are naked except for a 

 few scattered hairs on the under side of 

 the interfemoral membrane and on the 

 under side of the wings close to the hu- 

 merus aiul forearm. 



Color brown throughout, but always 

 paler on belly than on back. The exact 

 shade varies considerably, but is usually 

 a clear bister or sepia. Sometimes, how- 

 , Ears and membranes blackish in dry 



Fig. 24.— Top view of skull of (a) Yesper- 

 iilio bahamensis, {b) Y. fuscits, and (c) 

 Y. serofinus (X2). 



with a 



Fig. 25.— Side view of slvull of {a) Yesjycr- 

 tilio bahaincrtsis, (h) V. fuscus, and (c) 

 Y. serotinus { 2) . 



ever, it approaches cinnamon 

 specimens. 



mai—The skull of typical Yespertnio fuscvs (figs. 24 Z>, h) averages 

 2772— Ko. 13 — -7 



