254 PROCEEDINGS OF THE ACADEMY OF [March, 



Teeth. — Central pair of upper incisors broad with a straight, shghtly 

 bilobate cutting edge ; lateral upper incisor low, in basal outline equal 

 to the median tooth; upper canine slightly recurved; first upper pre- 

 molar subovate in basal outline, the greatest length of the tooth sub- 

 longitudinal ; second upper premolar subpentagonal in outline, trans- 

 verse, cusp distinct and caniniform, internal cingulum developed as a 

 distinct rim to a slightly excavated area; first and second upper 

 molars subquadrate, with the para-metaconoid ridges distinct and high, 

 the paracone developed as a distinct shoulder, protocone and hypocone 

 distinct, the former higher than the latter; third upper molar trans- 

 verse, para-metaconoid ridge deflected internally, protocone quite 

 distinct. Lower incisors obscurely tridentate, the median teeth in 

 size considerably exceeding the laterals which are crowded against 

 the canines ; lower canines erect, slightly curved and slightly tapering ; 

 first lower premolar subquadrate in basal outline, cusp longitudinal, 

 acute-angulate ; second lower premolar very small, circular in basal 

 outline, crowded between the first and third premolars and deflected 

 toward the lingual side of the tooth-row ; third lower premolar rather 

 elongate-quadrate, cusp rather high, acute; molars with the inter- 

 spaces deeply excavated, the paraconid and hj^poconid lower than 

 the other cusps. 



Measurements. — Average of five Dominican specimens: Total length 

 70.8 (70-75) mm.; head and body 52.2 (51.3-53); head 18.9 (18.1- 

 19.5); ear 16 (15.5-17); tragus 4.8 (4.5-5.5); forearm 46.2 (45-48); 

 thumb 8.5 (8.1-9.1); third digit 77.4 (75-79); tibia 17.5 (17-18.1); 

 calcaneum 21.6 (19-24); foot 11.1 (10.8-11.5); tail 20.6 (18-22). 



Average of two Dominican skulls: Total length 16.7 (16.5-17); 

 greatest zygomatic breadth 9.1 (9-9.3); interorbital width 4; height 

 at base of the second premolar 3.9 (3.8-4) ; height of brain-case 6.7 

 (6.4-7); width of palatal constriction 1.3; length of palate from ante- 

 rior foramina 7.1 (7-7.3) ; width of palate including teeth 6.2 (6.1-6.3) ; 

 greatest length of mandible 11.9 (11.6-12.3); breadth of brain-case 

 above roots of zygomata 8.3 (8.2-8.5). 



Remarks. — This form is apparently uniform in size through its range, 

 as Wagner's measurements of the type of gymnonotus {I.e.) are not ma- 

 terially different from those of the Dominican series examined. The 

 typical form can readily be distinguished from davyi fulvus by the 

 larger size and the position and less crowded character of the first 

 upper premolar. 



Specimens Examined. — Five alcoholic specimens. Dominica. [U. S. 

 N.M.] 



