{OK INDEX GENERUM MAMMALIUM. 
Xapus (see Zapus). Glires, Zapodid:e. 
Xenelaphus Gray, 1869. Ungulata, Artiodactyla, Cervidie. 
Proc. Zool. Soc. London, 1869, 496-498, 2 figs. in text; Cat. Ruminant Mamm. 
3rit. Mus., 88-90, 1872. 
Type: Xenelaphus huamel Gray, from Tinta, southern Peru (referred to Capreolus 
leucotis Gray, but afterwards renamed Xenelaphus anomalocera—Ann. & Mag. 
Nat. Hist., 4th ser., X, 445, Dec., 1872). - 
New name for Anomolocera Gray, 1869, which is preoccupied by Anomalocera Tem- 
pleton, 1837, a genus of Crustacea. 
Xenelaphus: €€vos, strange; aos, deer—in allusion to the horns, which are 
unlike those of any other deer. 
Xenochirus GLocER, 1841. Marsupialia, Phalangerid:e. 
Hand- u. Hilfsbuch Naturgesch., I, pp. xxx, 85, 1841; Tuowas, Ann. & Mag. 
Nat. Hist., 6th ser., XV, 190, Feb. 1, 1895. 
Type: Didelphis sciurea Shaw, from eastern Australia. 
Name antedated by Belideus Waterhouse, 1839. 
Nenochirus: €€vos, strange; yeip, hand—in allusion to the fact that the fifth toe 
on the forefoot, contrary to the usual rule, is the longest. 
Xenomys Merriam, 1892. Glires, Murid:e, Neotomin:e. 
Proc. Biol. Soc. Wash., VII, 160-163, Sept. 29, 1892. 
Type: Yenomys nelsoni Merriam, from Hacienda Magdalena, Colima, Mexico. 
Xenomys: vos, strange; 40s, mouse—from the combination of characters of 
skull and teeth, which are unlike those of any other known rodent. 
Xenurus WacLER, 1830. Edentata, Dasy podid:e. 
Nat. Syst. Amphibien, 36, 1830; Gray, Cat. Carn., Pachyderm., & Edentate 
Mamm. Brit. Mus., 383-384, 1869. 
Type: Dasypus gymnurus Maximilian (=D. wnicinctus Linn:eus), from Brazil. 
Name preoccupied by Venurus Boie, 1826, a genus of Birds. Replaced by Lysturus 
Ameghino, 1891. (See also Cabassous MeMurtrie, 1831; Arizostus Gloger, 
1841; and Tatowa Gray, 1865.) 
Nenurus: €€vos, strange; oOp«, tail—in allusion to the slender, nearly naked tail, 
which is covered with only a few small dermal plates. 
Xeromys Tuowas, 1889. Glires, Murid:e, Hydromyin:e. 
Proc. Zool. Soc. London, Oct. 1, 1889, 248, pl. xxix. 
Type: Xeromys myoides Thomas, from Port Mackay, Queensland. 
Xeromys: Enpos, dry (&5yp&, dry land); “0s, mouse—‘‘ obviously a land- and 
not a water-animal and on this account, in contradistinction to its aquatic 
ally Hydromys, 1 propose to call it Xeromys." (THomas.) 
Xerospermophilus (subgenus of Spermophilus) MERRIAM, 1892. — Glires, Sciuridee. 
Proc. Biol. Soc. Wash., VII, 27, Apr. 13, 1892; TRovxEssaART, Cat. Mamm., new 
ed., fasc. rr, 437, 1897. 
Type: Spermophilus mohavensis Merriam, from the Mohave River, near Victor, 
San Bernardino County, California. 
NXerospermophilus: Enpos, dry, parched; +Spermophilus—i. e.,a desert spermophile, 
Xerus (subgenus of Seiurus) Hempricn & EHRENBERG, 1832. Glires, Sciuridee. 
Symbol: Physic, Mamm., I, sig. ee, pl. ix [5 pp. text], Aug., 1832; Lesson, 
Nouv. Tableau Régne Animal, Mamm., 110-111, 1842 (under Spermosciurus); 
GRAY, List Spec. Mamm. Brit. Mus., pp. xxv, 144, 1843 (raised to generic 
rank); Ann. & Mag. Nat. Hist., 3d ser., XX, 271, Oct., 1867; 332-334, Nov., 
1867; TRovEssaART, Cat. Mamm. Viv. et Foss., Rodentia, 1° part., 84-86, 1880; 
Tuowas, Proc. Zool. Soe. London, 1897, 933 (type mentioned). 
