Myotis &c. from Central and South America. 543 
forearm and, very thinly, on the interfemoral membrane, 
legs, and feet. General colour, as usual in this group, very 
variable, varying from smoky greyish to buffy; Ridgway’s 
“ hair-brown”’ and “ wood-brown”’ nearly represent two of 
the phases. Individually the hairs are whitish, tipped with 
some shade of brown. Face with four fairly well-marked 
white streaks in the usual positions. 
Skull smaller, lighter, and more delicately built than in 
A. glaucus, which it resembles in its general form, narrower 
in the muzzle than in A. cinereus. 
Teeth closely similar in their proportions to those of 
A. glaucus *, the molars of the broadened shape found in that 
species, and therefore different from those of A. Rosenbergi, 
in which also m.’, both above and below, is proportionally 
very much smaller than m.'. 
Dimensions of the type :— 
Forearm 38 millim. 
Skull: greatest length (approximate) 19; zygomatic 
breadth 11:7; intertemporal breadth 4°5; mastoid breadth 
9°5; palate, length 8:5, breadth across molars 8°3; front of 
upper canine to back of m.’ 6:2. 
Other dimensions of a specimen softened and placed in 
spirit :— 
4 Ear, length 15, breadth from most convex point of inner to 
most concave part of outer margin 9; third finger, meta- 
carpal 36, first phalanx 14, second phalanx 20 ; lower leg 17; 
depth of interfemoral in centre 11. 
Hab. Bogava, Chiriqui, Panama. Altitude 250 m. 
Type. Male. B.M. no. 0. 7.11.19. Original number 47. 
Collected 24th October, 1898, by Mr. H. J. Watson. Four 
specimens examined. 
By the presence of the minute posterior lower molar this 
species differs from the common Central- American A. e¢nereus 
and its allies, and resembles the larger A. glaucus of Peru. 
A, Rosenberg, of which the only known specimen has this 
tooth on one side and not on the other, may be distinguished 
by the different proportions of its molars, 
Sylvilagus surdaster, sp. n. 
A dark-coloured hare with very short blackish ears and 
minute bulle. 
Size about as in S. Grabbit, which appears to be the 
nearest ally. Fur thick, close, and rather harsh, the longer 
hairs of the back about 20 millim. in length. General colour 
* Described and figured, P. Z. S. 1893, p. 336, pl. xix. figs. 7-9. 
