new Juiroj>eau Vulcs. 197 



amjjhibius and A. terrestris in colour^ but is readily distin- 

 guishable from the nortliern forms by its broad nasals. 

 With the material at hand there are no apparent characters 

 to distinguish the Biarritz specimens from those taken in 

 Ari^ge and the Pyrenees Orientales at altitudes of about 

 4800 feet. 



Mlcrotus arvalis meridianus, subsp. n. 



7y;?^.— Adult female (skin and skull). B.M. no. 6.6.4.26. 

 Collected at Biarritz, Basses Pyrenees, France, April 13, 

 1906, by J. F. Davison, Esq. Original number 30. Pre- 

 sented by the collector. 



Characters. — Similar to Microtus arvalis arvalis of Central 

 and Northern Grermany, but coloration much more buffy 

 (upperparts a finely grizzled yellowish brown, the general 

 eft'ect something between wood- brown and a very light bister; 

 uuderparts as in true arvalis^ but with a more evident buffy 

 wash ; feet buffy white ; tail not sharply bicolor, dark 

 brownish above, buffy white below). 



Measuremerds. — Type. Head and body 115 mm. ; tail 32 ; 

 hind foot 16; ear from meatus 12. Skull: condylo-basal 

 length 25'4 ; zygomatic breadth 15 ; interorbital constriction 

 3*0 ; occipital breadth 11 ; occipital depth Cinedian) 6"0; nasal 

 7"2 ; diastema 8*0 ; mandible lt)'2 ; maxillary tooth-row 6"4 ; 

 mandibular tooth-row 6"4. 



Specimens examined. — Seven, all from the type locality. 



Microtus Itvis, sp. n. 



Type.— Adnh male (skin and skull). B.M. no. 4. 4. 6. 55. 

 Collected at Gageni, Roumania, April 25, 1899, byW. Dodson. 

 Original number 67. Presented by the late Lord Lilford. 



Characters. — Externally as in }licro(us arvalis of Central 

 and Northern Germany ; skull differing from that of true 

 M. arvalis in greater length (condylo-basal length usually 

 mure than 2i}> mm. instead of 24 to 25*6 mm.) and less 

 relative breadth (ratio of zygomatic breadth to condylo-basal 

 length about 50 instead of about 55), much longer narrower 

 brain-case (distance from interorbital constriction to condyle 

 decidedly greater than zygomatic breadth), more inflated 

 audital bullae, and in tlie smoothly rounded interorbital 

 region, which, together with sides of brain-case, apparently 

 never develops distinct ridges; teeth as in M. arvalis. 



JJeusurenioil.s. — 'i'ype. llead and l)ody 110 mm. ; tail 38 ; 



