1904.] Allen, Mammals from Tropical America. 4 1 



Similar to A. vellerosus, but with little or no white on the sides of 

 the head, and the inside of the arms and legs mostly black. 



In A teles vellerosus the inside of the arms down to the hands, and 

 the whole inside of the thighs and the legs to the feet are broadly yel- 

 lowish white. In A. pan there is a narrow whitish stripe on the inside 

 of the shoulder, rapidly narrowing distally and rarely extending more 

 than half-way to the elbow, the fore arm being black all around. The 

 light color of the underparts extends down the inside of the thighs 

 and hind legs, rapidly narrowing distally, usually about to the knees, 

 but sometimes as a very narrow, indistinct light line to the feet, con- 

 sisting often merely of scattered grayish hairs, but never forming a 

 broad band as in vellerosus. 



The whitish patch on the sides of the face is either almost wholly 

 absent, or is represented by an indistinct cluster of whitish hairs 

 opposite the angle of the mouth, but not extending up to the sides of 

 the forehead, as in vellerosus. 



Measurements. The 7 largest males and the 7 largest females which 

 have measurements (for several they are not given) measure as follows : 



$ , Total length, 1310; tail vertebrae, 832; hind foot, 183. 

 3. 1275; 815; 191. 



3, 1210; " 670; " " 161. 



3. I][ 97'. 7 21 ; I 7 2 - 



$, 1148; 820; 175. 



3, 1142; 605; 175. 



$ , 1109; 706; 165. 



$ , 1250; " 822 ; 180. 



s, " 1235; " 820; " 175. 



$, 1232; 791; 174- 



$, 1231; 792; 179. 



? , 1160; 740; 170. 



$, " 1152; 770; 170. 



?, " 1150; " 630; 163. 



While the teeth show that these specimens are fully adult, the 

 sutures and slight development of the temporal ridges indicate that 

 the greater part are comparatively young or middle-aged adults. One 

 male has the teeth greatly worn, and one female has them considerably 

 worn. These measure, respectively, basal length, $ 88, ? 81; zygo- 

 matic breadth, $ 72, ? 62. The others grade smaller, according to 

 age. A fully adult but not 'old' skull gives the following: Total 

 length, 1 08; basal length (inner base of incisors to posterior border of 

 occipital condyles), 77; zygomatic breadth, 64; mastoid breadth, 59; 

 orbital breadth, 55; length of palate, 29; length of nasals (following 

 curvature), 18; width of nasals, 8, at front margin, tapering to a point 

 posteriorly; upper premolar-molar series, 25; length of lower jaw 



