1855. Sciurus hypoxanthus (Lichenstein MS) Geoffroy, Voyage de la Venus, Zool. (text), pp. 158, 159 (on labels of squirrels from Berlin Museum, fide Nelson, Proc. Washington Acad. Sci., 1:38, May 9, 1899).
1855. Sciurus chrysogaster Giebel, Saugethiere, p. 650.
1867. Macroxus aureogaster Gray, Ann. and Mag. Nat. Hist., ser. 3, 20:423.
1867. Sciurus hypopyrrhous Gray, Ann. and Mag. Nat. Hist, ser. 3, 20:424.
1867. Macroxus morio Gray, Ann. and Mag. Nat. Hist., ser. 3, 20:424.
1867. Macroxus maurus Gray, Ann. and Mag. Nat. Hist., ser. 3, 20:425.
1887. Sciurus rufiventris? Rovirosa, La Naturaleza, 7:360 (1885-1886).
1897. Sciurus leucops Allen, Bull. Amer. Mus. Nat. Hist., 9:198.
1899. Sciurus aureogaster hypopyrrhus Nelson, Proc. Washington Acad. Sci., 1:42, May 9.
Range.—Eastern slope of Mexico from southern Tamaulipas southward to Tabasco and Chiapas. Marginal localities arranged clockwise beginning with the northernmost station of record are: Tamaulipas: Victoria; Altamira; down the coast to Veracruz: Coatzocoalcos; inland to Tabasco: Montecristo. Chiapas: Tumbala. Oaxaca: Mountains near Santo Domingo. Veracruz: Otatitlan; Orizaba; Jico; Jalapa. Puebla: Metlaltoyuca. Hidalgo: Sierra Encarnacion. Querétaro: Pinal de Amoles. San Luis Potosí: Valles. Tamaulipas: Forlón. Specimen No. 51383 Chicago Mus. Nat. Hist., labelled as from San Luis Potosí, in the State of the same name, does not represent, I suspect, a natural occurrence of the animal. Possibly the specimen was purchased there in the market, but was actually captured elsewhere.