European Species of the Subgenus Pitymys. 515 



attain the dimensions of M. ibericus (Gerbe). Tlieir colora- 

 tion is above " bistre," with a tinge of " isa1)ella colour/' 

 below grey with a strong admixture of " buff/') 



Four inguinal mammse (two on each side) and five foot- 

 pads on the hind sole were noted in the fresh specimens by 

 the collector. 



3. Microtus {Pitymys) Thumasi, Barrett-IIani."^ 



The skull of this large species, from Montenegro, bears 

 little resemblance to tliat of M. Savii, and is the very 

 converse of the very low skull of M. subterraneus ; it agrees 

 in its general features with the members of the M. duodecim- 

 costatus group, and likewise in the character of the pro- 

 truding upper incisors. In the pattern of m^ there is a 

 tendency towards formation of closed triangles, and the 

 middle outer triangle, with the exception of one specimen 

 (no. 1), is scarcely reduced. Taking the specimens one by 

 one, m' exhibits the following characters : — 



Collector's no. 85, ad. ? . — No closed triangles ; middle 

 outer triangle scarcely reduced. 



Collector's no. 16, ad. $ . — Outer and inner middle triangles 

 almost closed. 



Collector's no. 1, ad. ^ . — The outer and inner middle 

 triangles are closed on the right side ; on the left they are 

 confluent, fcrming a transverse loop. Middle outer triangle 

 reduced. 



Collector's no. 86, young ad. (^ . — No closed triangles. 



4. Microtns [Pitymys) Maria, sp. n. 



This delicate species is represented in the Natural History 

 Museum by seven spirit-specimens (B.M. nos. 94. 1. 1. 16 and 

 17; 94.3.19.6-8; 95.4.29.4 and 5) from Viilalva, Prov. 

 Lugo, Galicia, presented by the late Dr. V. L. Seoane. 



Coloration. — The specimens, which have been nine years in 

 spirit, show in the adult the upper parts of a brown tinged 

 Avith " raw umber " ; the lower parts are of a shining '' bull'.'* 



Compared with the members of the duodecimcostatus 

 group this form has a nairowc^r, more elongate, rather 

 flattened, low brain-case; zygomata less spreading; upper 

 incisors not protruding. Apart from its smaller size, the 

 skull resembles that of Microtus Savii, exaggerating some- 

 A\hat the latter's characteristic outline; the upper contour 

 represents an even straighter line, with more abruptly 



* Aun. & Ma{^. Nat. Hist. (7) xl p. 306 (1903). 



