418 Mr. 0. Thomas on 



Skull large, smootli, and rounded, the brain-case more 

 oblong than in the allied species, with less ridges and angles, 

 and without any median frontal concavity, the upper profile 

 being evenly and smoothly convex. Zygomata less boldly 

 expanded anteriorly. Palatal foramina well open behind. 



Teeth as usual in this group. Last upper molar with a 

 long posterior lobe, curved round at its extreme hinder end 

 to form a well-marked fourth internal angle to the tooth. 



Dimensions of the type (measured in the flesh) : — 



Head and body 102 mm.; tail 51; hind foot 19 ; ear 13. 



Skull: greatest length 25*3 ; basilar length 21*4; zygo- 

 matic breadth 13*2 ; length of upper molar series 5. 



Hab. Forest-region south of Trebizond. Type from 

 Sumela. 



Type. Male. B.M. no. 6. 3. 6. 173. Original number 

 2087. Collected 29 October, 1905. 



This, the first recorded Evotomys from anywhere near this 

 region, belongs to the well-marked group of large species 

 containing E. Nafjeri, norvegicus, and skomerensis. From any 

 of these it is distinguished by its smoother and less ridged 

 skull, without frontal concavity. In a specimen of E. skomer- 

 ensis of similar age to the type, the crests, ridges, and 

 median concavity are already well developed, so that although 

 the type is not an old specimen it would presumably not have 

 developed them. 



Microtus Roberii, sp. n. 



A large vole with a very long tail. Not a member of the 

 subgenus Arvicola. 



Size perhaps larger tlian in any known vole not an 

 Arvicola. Fur of medium texture ; hairs of back about 

 11 mm. in length. General colour above brown (nearest to 

 mummy-brown). Below greyish (near smoke-grey) with a 

 slight drabby suffusion. Ears fairly large, projecting well 

 out of the fur. Upper surface of hands and feet glossy 

 whitish, poUex with a very small and rudimentary nail, soles 

 with six large and distinct pads. Tail very long, longer than 

 in any vole not of the water-vole group, giving the animal 

 rather the appearance of a rat than a vole ; blackish above, 

 grey below ; the tip with a tuft of hairs 3-4 ram. in length. 

 Mammae 2 — 2 = 8. 



Skull oval, smooth, and little ridged, the brain-case rounded 

 above, not strongly angular; supraorbital ridges only ap- 

 proaching within 1 mm. of each other in the oldest examples. 

 Palatal foramina evenly opened, the broadest point just in 

 front of the centre. Posterior palate normally Microtine, the 

 lateral pits deep. Bullse large. 



