50 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



treme shortness of its tarsus (0.8 in.); and by the character of its fur, 

 which is described as being short and fine, while that of H. coppingeri, as 

 mentioned above, is particularly long and soft." (Thomas, /. c.) 



Genus ELIGMODONTIA F. Cuvier. 



Eligmodontia F. Cuvier, Ann. Sci. Nat. (2), VII, 1837, 168. Type, 



Eliginodontia typns, sp. nov. 

 Heligmodoiitia Agassiz, Nomen. Zool., Mamm., Addenda, 5, 1846. Emen- 

 dation of Eligmodontia F. Cuvier. 

 Eligmodon Thomas, Ann. & Mag. Nat. Hist. (6), XVIII, Oct., 1896, 307. 



Emendation of Eligmodontia F. Cuvier. 

 Calomys Waterhouse, P. Z. S., 1837, 21 (as a subgenus oi Mus). Type, 

 Mus bimaculatHsV^dX&v\\o\\s&. Preoccupied by Callomys D'Orbigny 

 & Geoffroy. 

 Callotnys Gray, List Mamm. Brit. Mus., 1843, 112 (as a full genus). 



= Calomys Waterhouse. 

 Hesperomys Waterhouse, Zool. Voy. Beagle, pt. ii, Mamm., 1839, 75. 

 No type ; proposed to include, apparently, all the New World Muridae 

 except the Voles and the genus Neotoma, or the "Sigmodontinae." 

 Mns bimaculatus was specifically used in defining the characters of 

 Hesperomys, and if this species be taken as the type, as it is quite 

 proper to do, Hesperomys becomes a synonym of Calomys Water- 

 house, 1837 {^^^^ Callomys D'Orbigny & Geoffroy). 

 The genus Eligmodontia includes at present about 20 commonly recog- 

 nized species and subspecies. Its range extends from southern Patagonia 

 northward to southwestern Brazil and Bolivia, east of the Andes, and in 

 the Andean region north at least to central Peru. Its metropolis, or area 

 of greatest abundance, includes Argentina, Paraguay, and Bolivia. Four 

 species have been recorded from the region here under consideration, but 

 only one is represented in the Princeton University Patagonian collections. 

 Eligmodontia and Pliyllotis appear to be inosculant groups, but lack of 

 material at present writing prevents a satisfactory investigation of the 

 matter. In 1901^ I felt convinced that \.\i& griseojlava group was better 

 referable to Phyllotis than to Eligmodontia, taking E. typus and E. mor- 

 gani as the standard for Eligmodontia, and Phyllotis darwini and P. 

 xanthopygus as the standard for Phyllotis. As, however, Mr. Thomas, 



'Bull. Am. Mus. Nat. Hist, XIV, p. 408, Nov. 39, 1901. 



