MICROTUS 671 



Miceotus ageestis leveenedii Crespon. 



1844. A[rvicola] levernedii Crespon, Faune Meridionale, i, p. 73 (Marshes 



between St. Gilles and Aigues-Mortes, Gard, France). Type in 



Nlmes Museum. 

 1857. Arvicola agrestis a. Blasius, Saugethiere Deutschlands, p. 369 (part). 

 1869. [Arvicola agrestis] var. nigra Fatio, Faune Vert. Suisse, i, p. 241 



(Engstlen, Berne, Switzerland. Alt. 1750 m.). Type in Geneva 



Museum. 

 1900. [Arvicola agrestis] rufa Fatio, Revue Suisse de Zool., vin, p. 472 



(Geneva, Switzerland). Type in Geneva Museum. 

 1905. Arv[icola] agrestis angustifrons Fatio, Arch. Sci. Phys. et Nat., 



Geneve, 4th ser., xix, p. 191, February 15, 1905 (Meiringen, Berne, 



Switzerland. Alt. 650 m.). Type in Geneva Museum. 

 1905. Arv[icola] agrestis latifrons Fatio, Arch. Soi. Phys. et Nat., Geneve, 



4th ser., xix, p. 194, February 15, 1905 (Geneva, Switzerland). 



Type in Geneva Museum. 

 1910. Microtus agrestis Trouessart, Faune Mamm. d'Europe, p. 175 (part). 



Type locality. — Marshes between St. Gilles and Aigues-Mortes, 

 Gard, France. 



Geographical distribution. — Alps, Jura, and neighbouring 

 portions of Switzerland and France ; also in the extensive marshes 

 on Mediterranean coast of France at mouth of the Rhone. 



Diagnosis. — Similar to Microtus agrestis agrestis, but skull 

 with brain-case tending to be longer and narrower, the distance 

 from condyle to back of interorbital constriction usually greater 

 than zygomatic breadtb. 



Measurements. — Type (adult female) : hind foot (dry), 20. 

 Adult male from the type locality : head and body, 131 ; tail, 

 46 ; hind foot (fresh), 20 • 6, (dry), 20 ; ear, 11*8. Immature 

 male from the type locality : head and body, 107 ; tail, 39 ; hind 

 foot (dry), 20 ; ear, 11-8. Three adult males from St. Cergues, 

 Vaud, Switzerland : head and body, 131, 132 and 133 ; tail, 37, 

 33 and 38 ; hind foot (dry), 18 ■ 6, 19 and 19. Adult male from 

 Meiringen, Berne, Switzerland : head and body, 127 ; tail, 40 ; 

 hind foot, 18*6. For cranial measurements see Table, p. 676. 



Specimens examined. — Sixty-six, from the following localities : — 

 Fbancb : Near St. Gilles, Gard, 6 (B.M. and Nlmes) ; Montauban, 

 Haute-Savoie, 1 ; Cranves-Sales, Haute-Savoie, 8, ; Lucinges, Haute- 

 Savoie, 2 ; Chamonix, Haute-Savoie, 1 (U.S.N.M.) ; Etupes, Doubs, 1. 



Switzebland : Geneva, 9 (Mottaz and Geneva ; types of latifrons Fatio 

 and rufa Fatio among latter) ; St. Cergues, Vaud, 5 (U.S.N.M.) ; Chesieres, 

 Vaud, 3 (Mottaz) ; Vallee de Joux, Vaud, 3 (Mottaz) ; Les Plans, Vaud, 1 

 nj.S.N.M.); Grindelwald, Berne, 1 (U.S.N.M.); Meiringen, Berne, 20 

 (B.M., U.S.N.M. and Geneva; type of angustifrons Fatio among latter); 

 Briinig, Berne, 1 ; Engstlen, Berne, 1 (Geneva ; type of niger Fatio) ; 

 Degersheim, St. Gallen, 1 (U.S.N.M.); Chur, Grisons, 1 (U.S.N.M.); 

 Oberholsen Valley, 1. 



Remarks. — Though not well differentiated from true Microtus 

 agrestis the Alpine form is usually distinguishable by its relatively 

 more elongate brain-case, a character often more evident in sub- 

 adult individuals than in those of more advanced age. The 



