ARVICOLA 41 3 



rostrum a little shallower compared with the depth of the brain- 

 case, with slightly less strongly curved and more protruding 

 incisors, and smaller cheek-teeth. 



For external and cranial measurements, see tables at end of 

 volume. 



Remarl-s.—TLh.\& appears to be in part the " Arvicola amphi- 

 bius " of de Selys-Longchamps ; he figures (^fitudes de Micro- 

 mammal., pis. i and ii, figs. 1 and 2) two skulls from Belgium 

 under this name. The Lataste Collection includes three skulls 

 from Belgium collected by de Selys-Longchamps himself and 

 labelled A. amphibkis; these agree closely with his figures on the 

 one hand, and I am unable to distinguish them from skulls of A. 

 s. scherman on the other. " A. terrestris " of de Solys-Long- 

 charaps, cited by Miller in the synonymy of the present subspecies, 

 is a synonym of ^ . s. exitiis, being based uj^on Swiss material. 



86. Arvicola scherman exitus Miller. 

 1839. Arvicola terrestris Savi, Nuovo Giorn. de'Letterati, Pisa, 37, 



p. 300 (p. 3 of separate); described from Geneva, Switzerland. 



Not Mus terrestris Linna;us, 1758. 

 1839. Arvicola terrestris de S6Iys-Longchamps, iStudes de Micro- 



mamm., p. 97, pis. i and ii, fig. 6. 

 1845. t Arvicola terrestris var. niger de S^lys-Longcliamps, Atti della 



sesta Riunione degli Scienziati Italiani, Milano, 1844, p. 321 ; 



type locality Lausanne, Switzerland {nomen nvdum). 

 1845 tArvicola terrestris var. castaneus de Selys-Longchamps, Atti 



della sesta Riunione degli Scienziati Italiani, Milano, 1844, p. 321 ; 



type locality Lausanne, Switzerland {nomen midum). 

 1857. Arvicola amphibius c. Arvicola terrestris auct., Blasius, Sauge- 



thiere Deutschlands, p. 355 (in part). 



1910. Arvicola scherman exitus Miller, Proc. Biol. Soc. Washington, 

 23, p. 21 ; Trouessart, Faune Mamm. d'Europe, 1910, p. x; Miller, 

 Catal. Mamm. W. Europe, 1912, p. 746. 



1911. Arvicola scherman e.cilis Lydekker, Zool. Record, 47 (1910), 

 Mamm., p. 54; accidental renaming of A. s. exitus. 



Type.—BM., No. 10.8.16.8; adult female, skin and skull, 

 collected by E. H. Zollikofer. 



Type locality. — St. Gallen, Switzerland. 



Range. — The Alps (not known from the Italian side) at 

 moderate elevations, and the immediately adjoining lowlands of 

 Switzerland and France; eastwards into the Tirol; northwards 

 into the Vosges Mountains ; the Hmits of its range not known. 



Characters. — External form and skull highly modified for 

 fossorial habits. Size very small, hind-foot 22-25 mm., condylo- 

 basal length 33 to 35 mm. Incisors projecting from the mouth 

 more conspicuously than in normal aquatic members of the 

 genus. Palmar and plantar tubercles greatly reduced in size, 

 the soles nearly smooth towards the heel. Swimming fringes 

 of hind-foot very slightly developed. Aunulation of tail finer 

 than in A. amphibius (about 20 instead of 15 to the centimetre). 



