1915.] Allen, Review of the ‘Sonik American Sciuride. | 307 
In brief, the most that can be assumed with any degree of certainty is 
that the present highly varied South American sciurid fauna (with one 
exception) reached its present dispersion through the early migration from 
North America of some ancestral type. The case of Sciurillus, so different 
from all other American forms, and so similar to East Indian and West 
African types, can hardly be accounted for on any theory of parallel 
development, its differences from any other American type being so 
varied and profound, and so fully in agreement with a possible African 
ancestor. 
ADDENDA. 
Since the foregoing pages were made ready for the press an important 
collection of mammals and birds has been received from the Antioquia 
district of western Colombia, a region previously unrepresented in the 
mammal and bird collections of the American Museum. ‘This collection 
was made by Leo E. Miller and Howarth S. Boyle, m continuation of the 
Museum’s explorations in western Colombia, November to March (both 
months inclusive), 1914-1915. Among the 200 or more mammals obtained 
are 46 squirrels, collected at the following localities; Santa Elena, Barro 
Blanco, and La Frijolera, in the Central Andes, in the vicinity of Medellin, 
at altitudes of 5000 to 9000 feet; Puerto Valdivia (altitude 360 feet), on the 
lower Rio Cauca; Malena (altitude 1000 feet), near Puerto Berrio, on the 
Rio Magdalena; Alto Bonito (altitude 1500 feet) and Dabeiba (altitude 
2000 feet), on the headwaters of the Rio Sucio, on the Pacific slope. This 
collection affords such important information on the squirrels of the Antio- 
quia district that it seems desirable to summarize it in the present connection. 
Page 192. Microsciurus otinus (Thomas). Type locality, “Medellin.” Six 
specimens: Puerto Valdivia (alt. 360 ft.), 3; Alto Bonito (alt. 1500 ft.), upper Rio 
Sucio, 4. These specimens are the first of this species to reach the American Mu- 
seum. 
Page 201. Leptosciurus pucheranii medellinensis (Gray). Seven’ speci- 
mens: Barro Blanco (alt. 7200 ft., just above Medellin), 4; Santa Elena (alt. 9000 
ft., also near Medellin) 3. These specimens are practically topotypes of medellinensis, 
not previously represented in the American Museum collection. ; 
Page 203. Leptosciurus pucheranii salentensis (Allen). Hight specimens, 
all from La Frijolera (alt. 5000 ft., just above Puerto Valdivia). 
These specimens are provisionally referred to salentensis, but they all have the 
black dorsal band more strongly developed than the type series of that form. In 
other features of coloration they are closely similar to typical salentensis. 
Page 222. Mesosciurus hoffmanni quindianus (Allen). Six specimens: 
Barro Blanco, 3; Santa Elena, 2; Malena, 1. 
