APISTOMYS 349 



the first outer infold shallow, leaving the anterior loop and first 



triangle confluent with each other, the second outer fold deep, 



ksubstantially closing the second or inner triangle, the third and 



fourth triangles broadly confluent with each other and with the 



[short and broad posterior loop ; m^ with a posterior loop, five 



Isubstantially closed triangles, and an anterior loop formed by a 



■little modified fourth outer angle opening anteriorly into the loop 



Iproper, which consists of a widely confluent and opposed fifth 



ipair of salient angles. This tooth differs from that of Dolomys 



jin that its fourth outer angle retains its primitive transverse 



Idirection instead of being turned backwards, while the fourth 



muter infold is quite clearly developed although rather shallow 



transversely. These peculiarities impart to the m^ of Apistomys 



m appearance greatly resembling that which it has in such 



typical voles as Microtus arvalis, and very different from that 



keen in Chionomys, Evotomys, Alticola, Dolomys and many other 



genera in which the anterior loop of m^ is " helmet-shaped " in 



consequence of the backward or more longitudinal direction of 



the fourth outer angle. 



Remarks. — As is evident from this description the differences 

 which separate Apistomys from Dolomys are scarcely of generic 

 importance. The broad palate and especially the peculiar 

 (irvah's-Yike m^ are, however, striking features in a member of 

 the group to which Dolomys and Mimomys belong; they 

 indicate that the possessor of such features was evolving in a 

 different direction from those pursued by the two other genera 

 mentioned. In these circumstances, Mehely having already 

 established the genus, Apistomys may for the present be treated 

 as distinct from Dolomys. 



The only species known is A. coronensis. 



1 . t Apistomys coronensis Mehely. 



1913. Evotomys glareolus Ehik, Foldt. Kozl., 43, p. 7. Not of 

 Schreber. 



1914. ApistoJ7iijs coronensis Mehely, Ann. Mus. Nat. Hungar., 12, 

 p. 203. 



Lectotype. — Since Mehely does not indicate a type for this 

 species, I now formally select the subject of his Taf. vi, figs. 6 

 and 7, as the lectotype. This is an imperfect left mandibular 

 ramus (belonging to an old individual) with all the teeth in place, 

 collected by Dr. J. Ehik and now in the collection of the 

 Hungarian Geological Survey. 



Type horizon and locality. — Pleistocene (" Zweite interglaciale 

 Periode ") of the Gesprengsberg, near Brasso (Kronstadt), 

 Hungary. 



Range in time and space. — Known only from the type horizon 

 and locality. 



Characters. — Size as in larger members of the Microtus arvalis- 



