354 INDEX GENERUM MAMMALIUM. 
Isothrix Wacxrn, 1845. Glires, Octodontide. 
Wiegmann's Archiv Naturgesch., 1845, Bd. I, 145-146. 
Species, 3: from Brazil: Isothrix bistriata (Natterer MS.) Wagner, from the Rio 
Guaporé and the Rio Negro; J. pachyura (Natterer MS.) Wagner, from 
Cuyaba; and I. pagurus (Natterer MS.) Wagner, from Borba. 
Isothrix: 760s, equal; §p7, hair. . 
Isotus (subgenus of Vespertilio) KoLENAtTI, 1856. Chiroptera, Vespertilionid:e. 
Allgem. Deutsch. Naturhist. Zeitg., Dresden, neue Folge, I, 131, 177-179, 1856. 
Species: Vespertilio nattereri Kuhl, and. V. emarginatus Geoffroy, from Europe. 
Tsotus: 160s, equal; OUS, @TOS, ear. 
Issiodoromys Crozer, 1845. Glires, Theridomyid:e. 
[Jssidioromis Croizet MS., BLAINVILLE, Comptes Rendus, Paris, X, 932 footnote, 
Jan.-June, 1840—nomen nudum?] 
[Issidixromys AGAsstz, Nomenclator Zool., Mamm., 16, 1842; Index Univ., 197, 
1846—nomen nudum.] 
Tssiodoromys CRorzET, in Gervais’ Zool. de la France, Patria, 522, 1845; Gervais, 
Dict. Univ. Hist. Nat., [IV, 41, 1844—nomen nudum?] XI, 203, 1848; Zool. 
et Paléont. Frangaises, 27, 1848-52; 2° éd., 35-36, 1859; PrcrEr, Traité Paléont., 
2° éd., I, 240, 1853; Trovessarr, Cat. Mamm. Viv. et Foss., Rodentia, 167, 1881. 
Type: Species not named by Blainville or Agassiz. In 1845 the genus was based 
on ‘le cobaye d' Auvergne’ of Croizet and Jourdan, and in 1848-52 the species 
was named Zssiodoromys pseudanxma by Gervais, from specimens collected in 
the vicinity of Issoire, Puy-de-Dóme, France. 
Extinct. Based on fragments of jaws. 
Issiodoromys: Issiodurum (Issoire), the town in France where the type species 
was found; 42c, mouse. 
Istiophorus Gray, 1825. Chiroptera, Phyllostomatid:e. 
Zool. Journ., II, 242, July, 1825; Griffith’s Cuvier, Animal Kingdom, V, 71 
footnote, 1827: Zool. Miscellany, 37, 1831; ALLEN, Proc. Biol. Soc. Wash., 
XIV, 184, 1901. 
Hüistiophorus AGAsstz, Nomenclator Zool., Index Univ., 183, 1846; Cours, Cen- 
tury Dict., III, p. 2841, 1889 (emendation). 
New name for Vampyrus Spix, which differs from Vampyrus Geoffroy. Species: 
V. cirrhosus Spix, and V. soricinus Spix, from Brazil. (See Griffith's Cuvier, l. c.) 
Name preoceupied by Zstiophorus Lacépéde, 1802, a genus of Pisces. (See Tra- 
chops Gray, 1847.) 
Istiophorus: i6rtopopos, carrying zum allusion to the large ears. 
Isutaetus AmEGHINO, 1902. Edentata, Dasypodide. 
Bol. Acad. Nac. Cien. Córdoba, X VII, 65, May, 1902 (sep. p. 63). 
Species: /sulaetus depictis Ameghino, from the Astraponotus beds; and I. petrinus 
Ameghino, from the Pyrotherium beds of Patagonia. 
Extinet. 
Tsutaetus: 7605, equal; +- Utaetus. 
Itenocephalus (see Stenocephalus). Edentata, Megalonychid:e (Orthotherid:e). 
Ithygrammodon OsnonN, Scorr & Speir, 1878. Ungulata, Camelidee. 
Palieont. Rept. Princeton Sci. Expd. 1877, in Cont. Mus. Geol. & Arch:eol. 
Princeton College, No. 1, pp. 56-60, pl. x, figs. 1-4, Sept. 1, 1878. 
Type: Jthygrammodon cameloides Osborn, Scott & Speir, from the Eocene near 
Fort Bridger, Wyoming. 
Extmet. ‘* Established upon the two premaxillary bones, containing the inci- 
sors, parts of the maxillaries, the canine and the first premolar; besides frag- 
mentary portions of the palatine plates.”’ 
