342 MICROTIN^ 



being often obsolete. In young specimens tbe salient angles 

 are acute, but in later stages of wear they are rounded and the 

 crown view of the teeth acquires a general appearance strikingly 

 like that seen in Evotomys and some other genera. The anterior 

 loop of m^ in specimens in which the sixth inner angle is obsolete 

 closely resembles that of Microtus [Chionomys) nivalis or Evotomys 

 glareolus. 



Molar roots : m^ with three roots, a large anterior, a smaller pos- 

 terior and a very slender root supporting the second inner angle ; 

 m- with two roots, an anterior and a posterior, the former being 

 the stouter; nfi with two recurved roots of which the posterior 

 is the stouter and shows a strong lateral compression ; m^, mj 

 and mg each with two roots, the anterior root being the stouter 

 in mj, the posterior the stouter in m^ and mg. 



Palate nearly as in Arvicola with a broad, flat median crest; 

 short, well-defined and complete lateral bridges; shallow lateral 

 grooves ; and short and broad posterior median sloping septum. 



Measurements (cited from Mehely). — m^-m^ (adult) measured 

 on grinding surface, 8-1 mm. ; m-^^^m^ (adult) 8-5-8-6 (alveolar 

 measurement, 9 mm.). Individual teeth: tn}, 3; m^, 2-4; m^, 

 2-7-3-3; OTi, ^4-2 (juv. 3 mm.); m^, 2-4~2-5 (juv. 1-7 mm.); 

 m.^, 2. 



Remarks. — This remarkable species is known to me only 

 from the admirable descriptions and figures published by Nehring 

 and Mehely. 



2. tDolomys episcopalis Mehely. 



1911. Evotmnys glareolus Kormos, Foldtani Kozlony, 41, p. 740. 



Not of Schreber. 

 1914. Pliomys episcopalis Mehely, Ann. Mus. Nat. Hungar., 12, 



p. 198. 



Lectotype. — Since Mehely has not indicated which of the 

 specimens described by him should be taken as the type, I now 

 formally select the subject of his Taf. v, fig. 10, as the lecto- 

 type. The specimen referred to is an old right mandibular 

 ramus collected by Dr. Kormos and Dr. Ehik, and now in the 

 collection of the Hungarian Geological Survey (Kon. Ung. Geolog. 

 Reichsanstalt). 



Type horizon and locality. — Lower Pleistocene (" erste inter- 

 glaciale Periode ") of the Somlyo-Berg, near Piispokfiirdo, 

 Bihar, Hungary. 



Range in time and space. — At present known only from the 

 type locality and horizon. 



Characters. — Distinguished from D. milleri by its smaller 

 size and more reduced m^. 



Palate normal, but with the lateral bridges short or incom- 

 plete; median sloping septum short and broad, though perhaps 

 somewhat longer than in Mimomys intermedins, etc. Alveolus 

 of lower incisor extending posteriorly to the level of the upper 



