CHAPTER X

THE ORDER RODENTIA 443

Suborder SIMPLICIDENTATA 448

Section SCIUROMORPHA, 448. Family ANOMALURIDÆ, 449; Anomalurus, 449. Family SCIURIDÆ, 450; Sciurus, 450; Rhithrosciurus, 452; Xerus, 452; Tamias, 452; Pteromys and Sciuropterus, 453; Eupetaurus, 454; Extinct genera, 454; Arctomys, 454; Cynomys, 455; Spermophilus, 456; Extinct genera, 457. Family HAPLODONTIDÆ, 457; Haplodon, 457. Family CASTORIDÆ, 457; Castor, 457. Section MYOMORPHA, 459. Family MYOXIDÆ, 459; Myoxus, 459; Eliomys, 459; Graphiurus, 459; Claviglis, 460; Muscardinus, 460. Family LOPHIOMYIDÆ, 460; Lophiomys, 460. Family MURIDÆ, 461; Hydromys, 461; Xeromys, 461; Platacanthomys, 462; Gerbillus, 462; Pachyuromys, 462; Mystromys, 462; Otomys and Dasymys, 462; Malacomys, 462; Phlœomys, 462; Dendromys, 463; Cricetus, 463; Holochilus, 464; Sigmodon, 464; Rhithrodon and Ochetodon, 464; Neotoma, 464; Hypogeomys, 465; Nesomys, 465; Brachytarsomys, 465; Hallomys, 465; Eliurus, 465; Phenacomys, 466; Arvicola, 466; Synaptomys, 467; Myodes, 467; Cuniculus, 470; Fiber, 470; Neofiber, 472; Ellobius, 472; Siphneus, 472; Deomys, 473; Mus, 473; Nesocia, 475; Golunda, 476; Uromys, 476; Chiruromys, 476; Hapalotis, 476; Mastacomys, 476; Acanthomys, 476; Echinothrix, 477; Typhlomys, 477; Cricetomys and Saccostomus, 477; Pithechirus, 477. Family SPALACIDÆ, 477; Spalax, 477; Rhizomys, 477; Bathyergus, 478; Georychus and Myoscalops, 478; Heterocephalus, 478. Family GEOMYIDÆ, 478; Geomys, 478; Thomomys, 478; Dipodomys, 479; Perognathus and Heteromys, 479. Family DIPODIDÆ, 479; Sminthus, 479; Zapus, 480; Dipus, 480; Alactaga, 480; Platycercomys, 480; Pedetes, 480. Section HYSTRICOMORPHA, 480. Family OCTODONTIDÆ, 480. Ctenodactylus, 481; Pectinator, 481; Octodon, 481; Habrocoma, 482; Schizodon, 482; Ctenomys, 482; Spalacopus, 482; Petromys, 482; Myopotamus, 482; Capromys, 482; Aulacodus, 483; Plagiodon, 483; Loncheres and Echinomys, 483; Mesomys, 483; Dactylomys, 483; Cercomys, 483; Carterodon, 484; Fossil forms, 484. Family THERIDOMYIDÆ, 484. Family HYSTRICIDÆ, 484; Erethizon, 484; Synetheres, 485; Chætomys, 486; Hystrix, 486; Atherura, 487; Trichys, 487. Family CHINCHILLIDÆ, 487; Chinchilla, 487; Lagidium and Lagostomus, 488; Extinct genera, 488. Family CASTOROIDIDÆ, 488; Castoroides, 488. Family DASYPROCTIDÆ, 488; Dasyprocta, 488; Cælogenys, 489. Family DINOMYIDÆ, 489; Dinomys, 489. Family CAVIIDÆ, 489; Cavia, 489; Dolichotis, 490; Hydrochœrus, 490; Extinct genera, 491.

Suborder DUPLICIDENTATA 491

Family LAGOMYIDÆ, 491; Lagomys, 491. Family LEPORIDÆ, 492; Lepus, 492.