Mammalian Diversity And Matses Ethnomammalogy In Amazonian Peru Part 5. Rodents Author Voss, Robert S. Author Fleck, David W. Author Jansa, Sharon A. text Bulletin of the American Museum of Natural History 2019 2024-04-18 2024 466 1 180 http://dx.doi.org/10.5281/zenodo.5414895 journal article 10.5281/zenodo.5414895 0003-0090 Isothrix bistriata Wagner, 1845 Figures 49 , 50 VOUCHER MATERIAL ( N = 16): Nuevo San Juan (AMNH 268271, 268272, 272808, 273056; MUSM 11243, 11247, 11248, 13305, 15325, 15326), Orosa (AMNH 73788, 73789, 74071– 74073), Zarate on Río Manatí (FMNH 112566). UNVOUCHERED OBSERVATIONS: Río Yavarí ( Salovaara et al., 2003 ), San Pedro ( Valqui, 1999 , 2001 ). IDENTIFICATION: Isothrix bistriata is a large, soft-furred (not spiny) grizzled-brownish rat with a pale (whitish) midfrontal blaze separating two black supraorbital stripes that extend posteriorly onto the nape; the ventral fur is gray-based yellowish or buffy. Unlike Dactylomys (the only other soft-furred arboreal echimyid in our region), the manual digits have strong, sharp claws, and the tail is densely covered with long, soft, outwardly curving hairs that are reddish at the base of the tail but blackish distally. In these and other morphological details (including external and craniodental measurements; table 37), our material closely matches the description provided by Emmons and Patton (2015a), who treated sev-