MICROTUS 



671 



MlCROTUS AGRESTIS LEVERNEDII Crespon. 



1844. A[_rvicola] levernedii Crespon, Faune M6ridionale, i, p. 73 (Marshes 



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



Nimes 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., viii, 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. Sci. 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. 



GeograpMcal 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 breadth. 



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 : — 

 France: Near St. Gilles, Gard, 6 (B.M. and Nimes); Montauban, 

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

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



Switzerland : Geneva, 9 (Mottaz and Geneva ; types of latifrons Patio 

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

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

 (U.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. 



Bemarhs. — 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 



