568 RODEKTIA 



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

 much more inflated anteriorly than posteriorly, and readily dis- 

 tinguishable from the rounder, more evenly inflated bulla of Glis 

 and Muscardinus. 



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

 sufficiently described. As compared with those of Miomys 

 quercinus the molar rows are more nearly parallel, and there is 



t^/ 



FIQ. 111. 

 Dyromys nitedula. Nat. size. 



FIG. 112. 

 Dyromys nitedula. Cheek-teeth. 



usually less contrast in size both above and below between the 

 premolar and last molar with the two middle teeth. 



Bemarhs. — Among the European Muscardinidse this species is 

 immediately recognizable by the combination of a dark face 

 streak and uniformly bushy tail. In size it is intermediate 

 between Muscardinus avellanarius and Miomys quercinus, but 

 nearer the former. In different parts of its range Dyromys 

 nitedula has become modified into four local races, three of 

 which occur in Europe. 



Dyromys nitedula nitedula Pallas. 



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

 cription, not synonymy (Region of the lower Volga, Russia). 



1782. Myoxus dryas Schreber, Saugfchiere, pi. coxxv b. ; description, iv, 

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



1857. Myoxus dryas Blasius, Saugethiere Deutschlands, p. 295. 



1906. Eliomys nitedulus Thomas, Proc. Zool. Soc, London, 1905, n, p. 348, 

 April 5, 1906. 



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



Type locality. — Region of the lower Volga, Russia. 



Geographical distribution. — South-eastern Europe north of 

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

 bution not known. 



