370 On Mammals from South America. 
Dimensions of the type (an old individual, in skin) :— 
Head and body 91 millim.; tail 70; hind foot (moistened) 
19°2; ear (moistened) 13:2. 
Skull: basal length 20; basilar length 18°5; greatest 
breadth 12°4; nasals 9°7 x 2°63; interorbital breadth 4°8 ; 
interparietal 64x 1°6; breadth of zygomatic plate 1:4, 
diastema 6; palatal foramina 4:3; length of upper molar 
series 3°5. 
Hab. Plains of Bogota. Coll. by G. D. Child, May 20, 
1895. 
A, bogotensis is distinguished from the first species above 
named by its smaller, and from the second by its larger size, 
the hind feet of old specimens of the three species being 
approximately as follows: —16-17, 19, and 22-23 millim. Its 
dark colour separates it from any other species known to me. 
In the unusually slender lower portion of its anterior zygoma- 
root it also seems to differ from all its allies. 
Acodon hirtus, sp. n. 
General external appearance very much as in A. longipilis, 
Waterh., with which the specimens have hitherto been con- 
founded. Fur shorter, coarser, and shaggier. General 
colour paler, especially on the sides and under surface, on 
which latter the tips of the hairs are almost white. Kars 
short, hairy, scarcely projecting beyond the fur. Hands and 
feet white ; fifth hind toe reaching to the middle of the first 
phalanx of the fowth. Tail markedly bicolor, dark brown 
above, white below. 
Skull with the general character of that of A. longipilis, 
but the muzzle is not elongated in the same striking way, a 
difference which at once distinguishes the species. Inter- 
orbital region smoothly rounded. 
Dimensions of the type (an adult skin) :— 
Head and body 113 millim.; tail 84; hind foot (moist- 
ened) 23; ear (moistened) 12. 
Skull: basal length 24°5; basilar length 22°5; greatest 
breadth 14; interorbital breadth 5; diastema 7°5; palatal 
foramina 6°3; upper molar series 4. 
Hab. Fort San Rafael, Mendoza. Coll. T. Bridges. 
Type: B.M. 60.1.5.15. Presented by G. R. Waterhouse, 
Esq. 
This species is evidently the representative of the Chilian 
A, longipilis on the eastern side of the Andes, just as 
A, macronya is of A. megalonyx. 
