Isthmomys Hooper and Musser, 1964 . Occas. Pap. Mus. Zool. Univ. Mich., 635: 12.

REVIEWED BY: S. Anderson (SA); W. Caire (WC); R. P. Canham (RPC); M. D. Carleton (MDC); L. N. Carraway (LNC); D. G. Huckaby (DGH); C. W. Kilpatrick (CWK); T. E. Lawlor (TL); R. H. Pine (RHP).

COMMENT: Included as a subgenus of Peromyscus by Hall, 1981:717, and Hooper, 1968, in King, ed., The Biology of Perotnyscus ( Rodentia), p. 38. Linzey and Layne, 1974, Am. Mus. Novit., 2532:1-20, studied the morphology of the spermatozoa. Reviewed by Carleton, 1980:118, 124, who considered Isthmomys a distinct genus. Pine et al., 1979, Mammalia, 43: 357, considered Isthmomys Hooper and Musser, a nomen nudum; Carleton, 1980, may have been first to make Isthmomys available (RHP). Subfamily Hesperomyinae; see comment under Cricetidae .