Order Rodentia - Family Cricetidae Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2 955 1189 book chapter 0-8018-8221-4 10.5281/zenodo.7316535 Delomys collinus Thomas 1917 Delomys collinus Thomas 1917 , Ann. Mag. Nat. Hist., ser. 8, 20: 197 . Type Locality: Brazil , Rio de Janeiro State , Itatiaya, 4800 ft ( 1463 m ). Vernacular Names: Montane Delomys . Distribution: Middle to upper elevations, 1000-2700 m, in disjunct mountain ranges (E Minas Gerais , Espírito Santo and Rio de Janeiro ), SE Brazil . Discussion: Voss (1993) noted the usual absence of pectoral mammae in this form, but absent clear mensural differentiation, elected to retain it under D. dorsalis , perhaps as a subspecies as originally placed by Thomas (1917 c ) ; whereas, Bonvicino and Geise (1995) obtained different fundamental numbers from collinus samples compared with those of D. dorsalis (2n = 82 in both) and recommended specific recognition. The concordance of these independent traits, and others, should be verified with larger samples as a basis for reinforcing their status as distinct species.