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Show 1884.] MURIDvE FROM CENTRAL PERU. 449 CALOMYS, Waterhouse.-Form cricetine; tail short, hairy; fin-very long and soft; feet small and slender, soles thickly hairy; mammae 2-2 = 8. Skull slightly made ; interparietal very narrow from befure backwards; interorbital edges square; palatine foramina long. Teeth as in the smaller Oryzomys. Species:-II. bimaculatus, Waterh. (type), H. elegans, Waterh., and II. gracilipes, Waterh. Range. From Peru across the continent southwards to Buenos Ayres and Bahia Blanca. VESPERIMUS, Coues.-Form murine; tail medium or long, thinly hairy; ears and feet large ; mammae 1-2 = 6. Skull generally lightly made, with large interparietal, rounded or square supraorbital margins, little developed anterior plate of zygoma root, and long palatine foramina. Teeth with low complicated crowns, the folds generally alternating on the two sides of each tooth. Species :-II. leucopus, Raf. (type), H. californicus, Gamb., H. aztecus, De Sauss., H. cinereus, Thos., H. taczanowshii, Thos., & c , & c , about 10 in all. Bange. North America, southwards to Peru. ONYCHOMYS, Baird.-Form arvicoline ; tail and ears very short; fore feet very large, with elongated claws ; hind feet short, with hairy soles and only four sole-pads ; mammae 0-2 = 4. Skull and teeth much as in Vesperimus. Species :-H. leucogaster, Wied. (type), and H. torridus, Coues. Range. Southern United States. SCAPTEROMYS, Waterhouse.-Form murine ; tail long and hairy ; feet unusually long ; thumb with a claw instead of a nail. Skull and teeth much as in Habrothrix, but upper part of infraorbital foramen larger, anterior plate more prominent, and teeth broader and heavier. Species:-II. tumidus, Waterh. (type), H. tomentosus, Licht. Bange. La Plata. PHYLLOTIS, Waterhouse.-Form murine ; tail of medium length, hairy; ears very large; feet short, soles naked; mammae 2-2 = 8 ; interdental palate-ridges 5. Skull with large interparietal, square or slightly beaded supraorbital margins, long palatine foramina, and very prominent zygomata. Teeth as in Habrothrix. Species:-II darwini, Waterh. (type), H. boliviensis, Waterh., H.griseqflavus, Waterh., and H. xanthopyyus, Waterh. Bange. Patagonian Subregion. 1 Apud Peters, Abb. Ak. Berl. 1860, p. 147. |
