566 



RODENTIA 



6 st Seville. {Dr. A. Buiz) Lord Lilford (p). 95. 3. 3. 22. 



6, ?. Seville, Spain. Lord Lilford (p). 11. 1. 1. 108-109. 



1. Goto Douaiia, Huelva. A. Chapman (c & p). 0. 5. 10. 1. 



Jerez, Cadiz. A. Chapman (c & p). S. 3. 26. 1-2. 



■> ,' 



Genus DYROMYS Thomas. 



1780. Myoxiis Zimmermann, Geogr. Gesch., ii, p. 351 (part). 



1857. Eliomys Blasius, Saugethiere Deutschlands, p. 288 (Sab-genus of 



Myoxus) part. 

 1890. Myoxus Reuvens, Die Myoxidae oder Schlaefer, p. 24 (Sub-genus of 



Myoxus) part. 



1906. Dvyomys Thomas, Proc. Zool. Soc, London, 1905. ii, p. 345, 



April 5, 1906 (Sub-genus of Eliomys). Not of Philippi, An. Mus. 

 Nac. de Chile, xiv, p. 20, 1900. 



1907. Dyromys Thomas, Ann. and Mag. Nat. Hist., 7th scr., xx, p. 40G, 



November, 1907 (Substitute for Dryomys). 



Type. — Mug niteduJa Pallas. 



GeoijrapJiiral di.sfribvtion. — From central Asia through Asia 

 Minor to Hungary and eastern Switzerland. 



Characfcrti. — Teeth resembling those of Elknitiis but relatively 

 smaller than in any of the other European members of the 

 family, the ci'owns with concavity less pronounced than in 

 Eliomys and cross-ridges better developed, the first intermediate 

 ridge in the upper molars nearly complete and scarcely lower 

 than the others ; three rudimentary ridges intercalated between 

 the main ridges of m^, m., and m.^ ; outer border of crowns of 

 upper molars with two high main cusps nearly as well developed 

 as in Eliomys, these usually supplemented by a minute anterior 

 or posterior cusp ; lower molars with outer cusps relatively lower 

 than in Eliomyi: and sub-equal in size, inner cusps essentially 

 as in the related genus : premolars both above and below with 

 crowns sub-quadrate in outline, nearly flat, the cusps obsolete, 

 the maxillary tooth crossed by four or five ridges, the anterior 

 of which are better developed than in Eliomys. Skull essentially 

 as in Eliomys, but parietals as broad as in Muscardinus ; the 

 angular process of mandible fenesti'ate. Externally differing 

 from Eliomys in the uniformly haired, distichous tail. 



HemarJcs. — Though nearly related to Eliomys this group 

 seems worthy of recognition as a genus. Seven forms are known, 

 four of which (three of them apparently local laces of one species) 

 occur in Eurojie. 



KEY TO THE EUROPEAN FORMS OF DYIWMYS. 



Skull broad and robust, the zygomatic 

 breadth about 17 mm. ; auditory bullae 

 decidedly enlarged (Rustschuk, Bul- 

 garia) D. robustiis, p. 572. 



Skull slender, the zygomatic breadth about 

 15 mm. ; auditory bullse not specially 

 enlarged D. nitedula, p. 567. 



