370 On new Species o/" Saccopteryx etc. 



1234. Collected 22nd September, 1900, by Perry 0. 

 Simons. Three specimens obtained. 



Tliis 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 R. pluvotis again it may be 

 separated by its smaller size and less darkened ears and feet. 

 R. microtis J Thos., from Bogota, has smaller ears, longer 

 palatal foramina, broader nasals, and larger molars. 



Tatu pastascv, sp. n. 

 Tatusid Kapphri, Thos. P. Z. S. 1880, p. 402 (iu part). 



Size and general appearance very much as in 2\ Kappleri, 

 Krauss, of which there are 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 oi Kappltri; 60 

 along the anterior and lateral edges of the same shield, as 

 against G5 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 tlie tail 

 there are only 28 scales in the second ring, instead of 33 and 

 31. On the pelvic shield tlie 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 T. Kappleri. 



Manus in the single specimen with a distinct claw to tlie 

 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 T. Kapp- 

 leri. 



Skull closely similar in its characters to that of T. Kappleri^ 

 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 

 surpassed below by the latter. But the chief difference lies 



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