﻿RHOGEESSA GRACILIS. 



127 



outer side with pores lying raostly at tlie bases of the fine hairs with 

 which the surface is beset. The thickened masses are of exactly the 

 same size and shape in the two ears and are placed symmetrically with 

 respect to the outlines of the conclis. 



Tragus slender and taper pointed, slightly bent backward at the 

 tip, and broadest oijposite anterior base. The anterior border is 

 slightly concave at base, then evenly convex to tip. The posterior 

 border is strongly concave from tip to a point slightly above the middle, 

 where the tragus attains a width nearly equal to that at level of ante- 

 rior base. From this point to the basal lobe the posterior border is 

 nearly straight and about parallel with the lower part of the anterior 

 border. Basal lobe small but prominent. Posterior border of tragus 

 crenulate, especially near the middle, where there are five or six minute 

 sharply projecting iDoints, from the bases of which thickened processes 

 may be traced a short distance into the substance of the tragus when 

 the latter is held to the light. 



Menibranes. — The membranes are thin and semitransparent, the uro- 

 patagium not different in texture from the wings. Throughout they 

 are entirely naked, except for a narrow line of hair on the wings extend- 

 ing along sides of body about to a line drawn halfway between knee 

 and elbow. On the uropatagium there is also a narrow hairy area 

 close to body and a sprinkling of fine hairs along the veins. Wings 

 from base of toes. Uropatagium (PI. I, fig. 12) attached at tip of ter- 

 minal caudal vertebra. 



Feet. — The feet are small and weak, distinctly less than half as long 

 as the slender tibire (PI. I, fig. 12). Toes longer than sole, cleft to 

 base. Oalcar slender but very distinct, about as long as free border 

 of uropatagium and terminating in a small and ill-defined lobule. 

 Keel remarkably well developed, extending from near tip of calcar 

 almost to base and supported by tour cartilaginous processes. 



Fur and color. — The fur is long, that on middle of back averaging 

 about 9 mm. It extends farther on the membranes than in R. parvula^ 

 but otherwise shows no peculiarities. In color it is everywhere light 

 sepia at base, then dull yellowish brown, that on the back tipped with 

 chestnut. As this description is from a specimen that has been 

 immersed in alcohol for nearly two years and a half, it can not be more 

 than approximately accurate. 



SMU. — The skull of Ehogee'ssa gracilis is longer and more slender 

 than that of E. tumida, and the forehead appears to be more abruptly 

 raised above the face line. The zygomata are less widely flaring in 

 front. Apparently the occiput is considerably narrower than in R, 

 tumida. From the material at hand it is, however, impossible to deter- 

 mine the cranial characters with accuracy, since of the skull of the 

 female topotype there remains only the mandible and rostral portion, 

 while the skull of the type is so much injured that it would not hold 

 together if removed from the skin and cleaned. 



