Bolomys lasiurus (Lund, 1841) . K. Dansk. Vid. Selsk. Naturv. Math. Afhandl., 8:50.

TYPE LOCALITY: Brazil, Minas Gerais, Rio das Velhas, Lagoa Santa .

DISTRIBUTION: E Bolivia, Paraguay, N Argentina, and Brazil south of the Amazon River.

SYNONYMS: arviculoides, brachyurus, fuscinus, lasiotus (of Lund, 1838), lenguarum, pixuna, tapirapoanus .

COMMENTS: Revised as part of Zygodontomys (Hershkovitz, 1962) . Inclusion of lasiurus within Bolomys (or Akodon), not Zygodontomys, supported by karyological and morphological information (see Gardner and Patton, 1976; Maia and Langguth, 1981; Voss and Linzey, 1981). Geographic variation assessed by Macêdo and Mares (1987), who retained only l. fuscinus and I. lasiurus as subspecies. They further placed lenguarum, a form tentatively retained as a species by Reig (1987) and Anderson and Olds (1989), in synonymy under B. I. lasiurus .