Sigmodon hispidus Say and Ord, 1825 . J. Acad. Nat. Sci. Philadelphia, 42:354.

TYPE LOCALITY: USA, Florida, St. Johns River .

DISTRIBUTION: SE USA, from S Nebraska to C Virginia south to SE Arizona and peninsular Florida; interior and E Mexico through Middle America to C Panama; in South America to N Colombia and N Venezuela.

SYNONYMS: alfredi, austerulus, berlandieri, bogotensis, borucae, chiriquensis, confinis, eremicus, exsputus, fervidus, floridanus, furvus, griseus, hirsutus, inopinatus, insulicola, komareki, littoralis, microdon, obvelatus, pallidus, sanctaemartae, saturatus, solus, spadicipygus, texianus, toltecus, tonalensis, villae, virginianus, zanjonensis .

COMMENTS: See comments under S. arizonae, S. inopinatus, S. mascotensis, and S. peruanus, forms formerly ranked as subspecies of S. hispidus . The homogeneity of speciesgroup taxa assembled here must be viewed skeptically. The synonymy of still other forms with S. mascotensis is likely. See Cameron and Spencer (1981, Mammalian Species, 158).