690 RODENTIA 



Colour. — The colour is less yellowish than in M. arvalis 

 nrvalls, the light element a pale ci'eam-buff, and the black tips to 

 the hairs slightly more conspicuous, the grizzle of upper parts 

 thus tending to be more evident, particularly along middle of 

 back. Feet dull whitish. Tail rather distinctly bicolor, dark 

 brown above, bufty white below. Underparts in most specimens 

 rather strongly suffused with pale cream-bufF. 



Skull and teeth. — The skull differs from that of the other 

 European races of Microtus arvalis in its more elongate form, 

 less widely spreading zygomata, and in a peculiar general smooth- 

 ness and lack of angularity. Brain-case elongated, the least 

 distance from interorbital constriction to back of condyle decidedly 

 greater than zygomatic breadth, while in the related forms it is 

 less tlian zygomatic breadth or at most barely equal. Depth of 

 brain-case rather greater than in true arvalis, in this respect 

 resembling duplicatus. General surface of skull noticeably 

 smoother and less angular than in the related forms, the inter- 

 orbital region and sides of brain-case rarely developing evident 

 ridges. Auditory bulke UvSually larger and more inflated than in 

 true arvalis, but this character not entirely constant. Teeth with 

 no special peculiarities. 



Measurements. — External measurements of type (adult male) : 

 head and body, 110 ; tail, 38 ; hind foot, 17*2; ear from meatus, 

 1 1 . Average and extremes of ten adults from the type locality : 

 head and body, 102-8 (101-110); tail, 35-5 (31-38); hind 

 foot, 1 6 • 6 (1 6 • 2-1 7 • 4) ; ear from meatus, 1 • 4 ( 1 0-1 1 • 5). For 

 cranial measurements see Table, p. 689. 



Specimens examined. — Thirty-two, from the following localities : — 

 Austria-Hungary: Cepin, near Eszek, Hungary, 8. 

 RouMANiA : Gageni, Prahova, 17 ; Bustenari, Prahova, 1 ; near 

 Bucharest, 3 (Mottaz) ; Dobrudscha, 1. 

 Bulgaria: Rustschuk, 1 (Andersen). 

 Italy: Caorle, Venice, 1. 



2 & 6 al. Cepin, Eszek, Hungary. Budapest Museum (e) . 94. 7. 23. 13-20. 



5(^,6 9. Gageni, Prahova, Ron- Lord Lilford (p). 4. 4. 6. 53-G3. 



mania. {W. Dodson.) (4. 4. 6. 55. Type of subspecies.) 



6. Bustenari, Prahova. Lord Lilford (p). 4, 4. 6. 64. 



(W. Dodson.) 



1. Dobrudscha, Roumania. Purchased (Pruliere). 86. 4. 2. 6. 



MICROTUS INCERTUS de Selys-Longchamps. 



1841. Arvicola incertiis de Selys-Longchamps, Atti della Seconda Riunione 



degli Scieuziati Italiani, Torino, 1840, p. .225 (near summit of 



St. Gothard, Switzerland). 

 18G9. [Arvicola arvalis] var. fulva Fatio, Faune Vert. Suisse, i, p. 236 



(near summit of Furka, Switzerland). Type in Geneva Museum. 

 1905. [Arvicola arvalis] var. flava Fatio, Arch. Sci. Phys. et Nat. Geneve, 



4th ser., xix, p. 195, February 15, 1905 (Renaming oi fulva). 

 1905. [Microtus incertus] Major, Ann. and Mag. Nat. Hist., 7th ser., xv, 



p. 511, May, 1905. 



