Proechimys semispinosus (Tomes, 1860) . Proc. Zool. Soc. Lond., 1860:265.

TYPE LOCALITY: Ecuador, Esmeraldas Prov., Esmeraldas .

DISTRIBUTION: SE Honduras to NE Peru and Amazonian Brazil.

SYNONYMS: burrus, calidior, centralis, chiriquinus, columbianus, goldmani, hilda, ignotus, kermiti, liminalis, panamensis, rosa, rubellus.

COMMENTS: Subgenus Proechimys . Formerly included amphichoricus; see Reig et al. (1980) who employed the name centralis for animals assigned to semispinosus from N Venezuela. Gardner (1983b) discussed the taxonomic history of this species and designated a new type locality. The chromosome no. is 2n=30; FN=50-54.