686 



MiCROTUS ARVALIS MERIDIANUS Miller. 



1908. Microtus arvalis meridianus Miller, Ann. and INIag. Nat. Hist. 



8tb ser., i, p. 197, February, 1908. Tyi^e in British Museum. 

 1910. Microtus arvalis meiidianus Trouessart, Paune Mamm. d'Europe, 



p. 174. 



Type locality. — Near Biarritz, Basses-Pyrenees, France. 



Oeograpliical distrihution. — South-western France, in and near 

 the Pyrenees. 



Diagnosis. — Like Microtus arcalis arvalis but larger (hind 

 foot, 15*8 to 16' 6; condylobasal length of fully adult skulls, 

 about 25 '5 mm.), and sHghtly more yellowish. 



Colour. — The colour so nearly resembles that of the typical 

 race as to require no detailed description. In general there 

 appears to be a tendency toward more conspicuous suffusion of 

 sides and underparts with buff. 



Slciill and teeth. — Apart from their greater size the skull and 

 teeth resemble those of M. arvalis arvalis. In some specimens, 

 however, the brain-case is unusually short, its outline almost 

 circular. 



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

 head and body, 115; tail, 32 ; hind foot, 16-6; ear, 1 2. Average 

 and extremes of four adult individuals from the type locality : 

 head and body, 106-2 (102-115) ; tail, 31-7 (30-34) ; hind foot, 

 16-1 (15' 8-16 -6) ; ear, 11 -2 (10-12). For cranial measurements 

 see Table, p. 689. 



Specimens examined. — Eleven, from the following localities in south- 

 western France: Porte, Pyren<-es-0rientale5, 1; Pic du Midi, Hautes- 

 Pyr6n6es, 1 skull (Lalaste) ; Biarritz, Basses-Pyr6n6es, 8 ; Pyrenees, no 

 exact locality, 1. 



9. Port6,Pyron6es-Orientales, 0. Thomas (p). 8.9.1.70. 

 France. (A. Robert.) 



2 6, 4 ?. Biarritz, Basses-Pyr6nees. J. F. Davison (c & r). 6. 6. 4. 23-28. 



(6. 6. 4. 2G. Ty2x of subspecies.) 



1. Pyrenees. Baron E. de S61ys- 45. 7. 5. 6. 



Longchamps (p). 



1 Tomes Collection. 7. 1. 1. 137. 



Microtus arvalis duplicatus Rorig and Biirner. 



1905. [Arvicola arvalis~\ forma duplicata Eorig and Burner, Arbeiten aus 

 der Kaiserlichen Biologischen Anstalt fiir Land- und Forstwirt- 

 schaft, V, Heft ii, pi. v. 



Type locality. — Rossitten, Ostpreussen, Germany. 



Geographical distribution. — Shores of the Baltic in north- 

 eastern' Germany. Limits of range not known. 



Diagnosis. — Like Microtus arvalis arvalis but attaining a 

 larger size (hind foot, 17 to 18-6 mm.; condylobasal length of 

 skull in fully adult individuals about 25 to 25 "5 mm.) ; colour 



