568 



RODENTIA 



zygomata. The form of the auditory bulla is also, as in Elioniys, 

 much more inflated anteriorly tlian posteriorly, and readily dis- 

 tinguishable from the rounder, more evenly inflated bulla of Glis 

 and Muacardimix. 



Teetli. — The detailed structure of the teeth has already been 

 sufliciently described. As compared with those of Eliomi/s 

 qu('rrinii.'< the molar rows are more nearly parallel, and there is 



FlC. 111. 

 Diirom.'jn iiltedula. Nat. size. 



i-'IG. 112. 

 Dtiromys niteihtla. Cheek-teeth, x 10. 



usually less contrast in size both above and Ijelow between the 

 premolar and last molar with the two middle teeth. 



Rcmarliii. — Among the European Mnscardinidse this species is 

 immediately recognizable by the combination of a dark face 

 streak and uniformly bushy tail. In size it is intermediate 

 lietween Muscardinus avellanarius and Eliomys quercinus, but 

 nearer the former. In difl'erent parts of its range Dyrowyx 

 nifednJn has become modified into four local races, three of 

 which occur in Europe. 



Dykomys nitedula nitedula Pallas. 



1778. Mils nitedula Pallas, Nov. Sp. Quadr. Glir. Ord., p. 88, part, des- 

 cription, uot synonymy (Region of the lower Volga, Russia). 



1782. Myoxus dnjas Schreber, Saugthiere, pi. ccxxv b. ; description, iv, 

 p. 831, 1787 (Region of the lower Volga, Russia). 



1857. Mijoxiis dnjas Blasius, Siiugethiere Deutschlands, x^- 29.5. 



1906. Eliom:/-^ nitcdultis Thomas, Proc. Zool. Soc, London, 1905, ii, p. 348, 

 April 5, 1906. 



1910. Dyromys nitedula Trouessart, Faune Mamm. d'Europe, p. 133. 



Tijpe localifi/. — Region of the lower Volga, Russia. 



Geographical distriltHtlon. — South-eastern Europe north of 

 the Balkan Peninsula, west to Hungary. Exact limits of distri- 

 bution not known. 



