1904.] NATURAL SCIENCES OF PHILADELPHIA. 443 



case without any abrupt depression ; palate with the posterior portion 

 rather broad, subequal. Mandible rather slender; ascending rami low, 

 coronoid process rather sharp, condylar process broad but compressed, 

 angle recurved, deflected laterally to a considerable extent. 



Teeth. — Central pair of superior incisors slender, compressed, dis- 

 tinctly projecting forward; lateral upper incisors of about the same 

 basal area as the median pair, but very low, not one-fourth the height 

 of the median pair. Upper canines slightly flaring, subreniform in 

 basal outline; first upper premolar elongate, strongly compressed, casp 

 low and placed anteriorly; second upper premolar touching and 

 slightly overlapping the first, elongate pyramidical in basal outline, 

 the apex interior and deflected toward the internal margin of the 

 tooth-row, cusp moderately high ; first upper molar narrowed anteriorly, 

 metacone inconspicuous and pressed against the hypocone-metaconule 

 ridge; second upper molar quadrate, cusps regularly placed; third 

 upper molar strongly transverse. Lower incisors small, compressed, 

 edges very faintly bilobate; lower canines slightly recurved; first 

 lower premolar oblong in basal outline, the internal margin slightly 

 rounded, cusp obtuse and low; second and third lower premolars 

 similar in basal outline, oblong, the third not more crowded than the 

 second; first lower molar smaller than the second, cusps similar in 

 character except that the entoconid is distinctly stronger in the second 

 than in the first tooth; third lower molar with the meta-paraconid 

 section very slight and weak in strong contrast to the distinct and 

 heavy ento-metaconid fold. 



Measurements. — Average of series of five alcoholic topotypes: Total 

 length 88.6 mm. (84.5-92.5) ; head and body 54.7 (50-58) ; head 23.8 

 (22.5-25); ear 30.7 (28-33); greatest width of ear 21.2 (20.5-22.5); 

 tragus 10.9 (10-12); forearm 50.5 (49.3-51); thumb 11.9 (10.8-12); 

 third digit 79.9 (77-83); tibia 21.7 (21-22.2); calcaneum 11.5 (10.2- 

 12.8); foot 11.5 (11-12.5); tail 33.9 (30-37). 



Average of six skulls: Total length 23.5 mm. (23-24.1); greatest 

 zygomatic width 11.5 (11-12); interorbital width 3.9 (3.8-4); height 

 at base of second premolar 3.5 (3-3.9) ; height of brain-case 8.1 (8-8.8) ; 

 breadth of brain-case above roots of zygomata 8.7 (8.4-9) ; width of 

 palatal constriction 2.2 (2-2.5); length of palate 9.5 (9.2-10); width 

 of palatal constriction 7.3 (6.9-7.9) ; greatest length of mandible 15.7 

 (15.2-16). 



Remarks. — This species can be distinguished from the waterhousii 

 group by the slenderer structure of the whole body and skull the 

 longer ear and the weaker dentition. 



