MAMMALS OF NORTHERN COLOMBIA—HERSHKOVITZ 7 
this paper reveal no specific differences. Allen’s concept of hoffmanni, 
conforms, in general, to the physical expression of the common species 
in the middle altitudes of the Colombian and Ecuadorian Andes. 
Thus, the “remarkable hiatus in distribution in northwestern Colombia 
and the southern part of Panama” of the typical form of hoffmanna 
that so confused Allen (1915, pp. 212, 219) and later investigators is 
disposed of. 
The distribution of hoffmanni as given by Allen (1915, p. 216) is 
considerably embroiled. It starts in Costa Rica, skips Panama 
where chiriquensis occurs, and the lowlands of northwestern Colombia. 
It reappears in the Andes of Colombia but with its continuity in the 
Cordillera Central interrupted by quindianus. It is further recorded 
from the Andes of Ecuador and is said to continue south to Bolivia. 
However, the recognition of the conspecificity of hoffmanni and the 
other described species in the areas concerned, with granatensis, re- 
solves the distributional anomaly into a logical, as well as natural, 
pattern. It may be possible to reassign most of the Colombian 
records given by Allen for hoffmanni to forms already described from 
there. His Ecuadorian records are assignable to either ambaburae or 
séderstrémi. Ellerman (1940, p. 340), aware of the distributional 
difficulty, lists séderstrémi as a validrace. The Bogotd form, generally 
known as S. hoffmanni hyporrhodus Gray, is replaced by S. granatensis 
chrysurus Pucheran (q. v.). 
Macrozus griseogena Gray (1867, p. 429). Allen (1915, p. 226) 
listed the original citation as a‘‘composite species,’ because Gray gave 
the habitat for griseogena as Honduras, Venezuela, Santa Fé de 
Bogoté, Mexico, Isthmus of Panama, and Volcan de Cartago in Costa 
Rica. This range does not appear to be too exaggerated, when it is 
recalled that this form has been considered at various times identical 
with hoffmanni by authors. Even Allen (1915, pp. 212, 224, 228) 
showed that intergradation took place between the two animals, but 
he kept the names apart. Thomas (1901, p. 193) fixed the type 
locality as Venezuela. It is here further restricted to San Julian on 
the basis of the specimens from this locality recorded by Robinson and 
Lyon and which are at hand. These authors submitted specimens to 
Thomas for comparison and they (1901, p. 144) recorded his opinion as 
follows: ‘The squirrel is very typical of S. griseogena Gray, the 
specimen No. 102721, being more exactly like the type than any 
others of the large numbers we have here [in the British Museum].’” 
Further treatment of griseogena is given later on in the text where it is 
demonstrated that it grades into granatensis of Colombia. 
Sciurus chapmani Allen (1899, p. 16). Described from the island 
of Trinidad. This squirrel is an extremely small representative of 
the commen species. It is indistinguisbable from the squirrels of 
Cristébal Colén at the tip of the Parfa Peninsula on the Venezuelan 
