370 On new Species of Saccopteryx ke. 
1234. Collected 22nd September, 1900, by Perry O. 
Simons. ‘Three specimens obtained. 
This species may be distinguished from R. dryas by its 
markedly larger size, skulls with worn teeth of the latter 
being considerably smaller than the three skulls of the new 
form, all rather younger. From &. pheotis again it may be 
separated by its smaller size and less darkened ears and feet. 
R. microtis, Thos., from Bogota, has smaller ears, longer 
palatal foramina, broader nasals, and larger molars. 
Tatu pastase, sp. n. 
Tatusia Kapplert, Thos. P. Z. 5, 1880, p. 402 (in part). 
Size and general appearance very much as in 7. Kappleri, 
Krauss, of which thereare two typical specimens in the Museum 
collection. But in a general way the scales are larger, so that 
there are fewer in each row. ‘Thus in the single specimen 
there are 58 scales bordering the shoulder-shield posteriorly, 
as against 66 and 68 in the two specimens of Kapplert; 60 
along the anterior and lateral edges of the same shield, as 
against 65 and 67; 54 in the third movable band, as against 
56 and 56; 52 along the outer and posterior edges of the 
pelvic shield, as against 59 and 57: and similarly on the tail 
there are only 28 scales in the second ring, instead of 33 and 
31. On the pelvic shield the scales are of less uniform size 
and smoothness, the larger scales standing up more promi- 
nently above the level of the smaller ones. 
On the other hand, the tail-scales, especially proximally, 
are smoother and flatter, the centre line of each, although 
slightly keeled, not being raised into a prominent outwardly 
directed point, as is the case in 7. Kapplert. 
Manus in the single specimen with a distinct claw to the 
fifth digit, there thus being five claws instead of the normal 
four. 
Back, and especially the pelvic shield, slightly, though very 
slightly, more hairy than in the allied species. 
Other external characters apparently much as in 7. Kapp- 
lert. 
Skull closely similar in its characters to that of 7. Kappleré, 
as figured by Krauss and Gray, with the following excep- 
tions :—The lateral occipital prominences are more developed, 
surpassing the median ridge posteriorly. The malar bones 
are broader in lateral view, projecting further downwards, so 
that a line drawn from the lower edge of one to that of the 
other is just at the level of the palatal edge, instead of being 
a 5 . . . . 
surpassed below by the latter. But the chief difference lies 
