192 Bulletin American Museum of Natural History. [Vol. XXXIV, 
Microsciurus similis similis Nelson. 
Sciurus (Microsciurus) similis Npison, Bull. Amer. Mus. Nat. Hist., XII, p. 78, 
April 14, 1899.— ALusmn, tbid., XX XI, p. 92, April 19, 1912. 
Microsciurus similis similis ALLEN, Bull. Amer. Mus. Nat. Hist., XX XIII, p. 
153, Feb. 26, 1914. 
Type locality — Near Cali, Western Andes, Colombia; altitude 6000 feet. 
Geographic distribution. Colombia; Western and Central Andes at 
altitudes of 4000 to 7200 feet. 
Microsciurus similis fusculus 7homas. 
Sciurus (Microsciurus) similis fusculus THomas, Ann. and Mag. Nat. Hist. (8), 
VI, p. 503, Nov. 1910. 
? Microsciurus similis fusculus LONNBERG, Arkiv. for. Zool., VIII, No. 16, p. 26, 
July 12, 1918. Near Gualea, Ecuador. 
Microsciurus similis fusculus ALLEN, Bull. Amer. Mus. Nat. Hist., XX XIII, p. 
154, Feb. 26, 1914. 
Type locality.— Juntas, Rio San Juan, Chocé district, Colombia; alti- 
tude 400 feet. 
Geographic. distributton.— Known only from the Choc6 district, Co- 
lombia. 
Microsciurus otinus Thomas. 
Sciurus (Microsciurus) otinus THomas, Ann. and Mag. Nat. Hist. (7), Vit, p. 
193, Feb., 1901. 
Microsciurus otinus ALLEN, Bull. Amer. Mus. Nat. Hist., AXXITI, p. 156, 
Feb. 26, 1914. 
Type locality.— Medellin, Colombia. 
Geographic distribution.— Recorded only from Medellin and Valdivia, 
at altitudes of about 3000 to 4000 feet. 
Microsciurus isthmius isthmius Nelson. 
Sciurus (Microsciurus) isthmius Newson, Bull. Amer. Mus. Nat. Hist., XII, p. 
77, April 14, 1899. 
Microsciurus isthmius isthmius AutEN, Bull. Amer. Mus. Nat. Hist., XX XIII, 
p. 157, Feb. 26, 1914. 
Type locality.— Truandé River, Isthmus of Darien, Colombia. 
Geographic distribution.— Coast region of Colombia from the Truandé 
River south to the Rio San Juan, Chocé district. 
