220 Bulletin American Museum of Natural History. [Vol. XXXIV, 
considerable series with which Mr. Osgood has compared it in the Field 
Museum. In other respects it does not seem to differ.” Through Dr. 
Stone’s kindness I have been able to compare this specimen with others 
from near the type locality, and also with large series from both western 
Colombia and Costa Rica. It differs from all the others in being rather 
more heavily suffused with rufous than average specimens from elsewhere, 
but a number of others so closely approach it in this respect that it seems 
more likely to be merely an individual variant than the representative of a 
local form, in view of the known occurrence of typical hoffmanni at Gualea 
and other localities in the Ecuadorian Andes. In fact it does not differ 
more from one of the Gualea specimens than the four Gualea specimens do 
among themselves. Of 2 specimens from Loja, one is in the rufous phase 
and the other like Gualea specimens; and of 3 from Santa Rosa 1 is in the 
rufous phase and the others are like average specimens from the Ecuador 
Andes. 
Microsciurus hoffmanni chiriquensis (Bangs). 
Sciurus (Guerlinguetus) estuans chiriquensis Banas, Bull. Mus. Comp. Zodl., 
XXXIX, No. 2, p. 22, April, 1902.— Atu=en, Bull. Amer. Mus. Nat. Hist., XX, p. 
66, Feb. 29, 1904 (referred to hoffmannt). 
Type locality.— Divala, Chiriqui, Panama; altitude, near sea level. 
Geographic distribution.— The low coast regions of Costa Rica and west- 
ern Panama, south to Chiriqui and adjacent islands. 
Description.— Similar to hoffmanni of the interior highlands of Costa Rica 
(Volcan de Irizt region), but slightly smaller, with harsher, shorter, and thin- 
ner pelage. ‘There are no very appreciable color differences, except a general 
tendency to a more rufous tone of the upperparts and redder underparts. 
The wide range of individual color variation in both forms is so extensive 
that specimens of the two forms from widely separated localities are often 
indistinguishable in coloration, although in general there is an appreciable 
average difference in coloration as well as in the character of the pelage. 
(For measurements see Table III, p. 219.) 
Specimens examined, 90.— Panama, 80: Divala, Chiriqui, 14 (type oe 
13 topotypes, Mus. Comp. Zodl.); Bouquete, Chiriqui, 19 (Am. Mus. 
Br. Mus. 6, Mus. Comp. Zoél. 9); Bogava, 12 (Br. Mus. 4, Mus. Comp. 
Zool. 8); Boqueron, 23 (Am. Mus.): Veragua, 2 (Br. Mus.); Tacoume, 1 
(Br. Mus.); Cebaco Island, 5 (Br. Mus.); Sevilla and Insoleta Islands, each 
1 (Br. Mus.); “Isthmus of Panama,” 2 (Br. Mus. i. 
Costa Rica, 10: Boruca, 4; Rio Sicsicola, 2, Cudbre, 2.1 mis, 1,Pozo 
Azul, 1, Sta. Clara, 1 (all Am. Mus.). 
4, 
