414 MICROTIN^ 



Colour of upper parts ranging between light " broccoli brown " 

 and ochraceous buff, the face, top of head and spinal region 

 somewhat darkened by blackish hair-tips, which are usually most 

 noticeable over the loins. Sides when brightest clear ochraceous 

 buff, when duller near greyish cream buff. Under parts paler, 

 less slaty grey than in the typical subspecies, the throat near the 

 grey No. 9 of Ridgway ; chest and belly washed with cream buff. 

 Feet " ecru drab," sometimes tinged with buffy. Tail whitish 

 throughout, or sprinkled with blackish hairs above; sometimes 

 rather distinctly bicoloured. 



Skull smaller than in the typical form and distinguished by its 

 much more marked fossorial specialization. Incisors more pro- 

 jecting or " proodont," rostrum shallower in relation to the depth 

 of the braincase ; occiput more obliquely truncated in adults. 

 Auditory bullae much smaller, their outer faces noticeably but 

 irregularly flattened. Mandibular angular processes usually very 

 small. Cheek-teeth normal, but anterior loop of m^ usually short 

 and wide. 



For cranial and external dimensions, see tables at end of 

 volume. 



8c. Arvicola scherman monticola de Selys-Longchamps. 



1838. Arvicola monticola de Selys-Longchamps, Rev. Zoologique, 

 p. 249; ;fitudes de Micromammalogie, 1839, p. 92, pis. i and ii, 



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



thiere Deutschlands, p. 355 (in part). 

 1910. Ari'icola scherman mmiticola Miller, Proc. Biol. See. Washington, 



23, p. 22; Trouessart, Faune Mamm. d'Europe, 1910, p. x; Miller. 



Catal. Mamm. W. Europe, 1912, p. 749. 



Type. — Unknown. 



Type locality. — St. Bertrand de Comminge, Hautes-Pyrenees, 

 France. 



Range. — Pyrenees and their immediate neighbourhood (known 

 at present from the French side only) ; Puy-de-D6me ? 



Characters. — Distinguished from A. s. exitus by its larger and 

 more evenly inflated auditory bullae and by the longer and 

 narrower anterior loop of w?j . 



For external and cranial measurements, see tables at end of 

 volume. 



9. t Arvicola abbotti Hinton. 



1823. "Water Rat" Buckland, Reliquia; Diluvianse, pp. 18, 33, 34, 



49, pi. xi, figs, i-8, 11, 12. 

 1825. Hypudmus " Espece de Campagnol a peu pres de la taille du 



rat d'eau," Cuvier, Oss. Foss., ed. 3, 5, pi. 1, p. 54. 

 1846. Arvicola amphibia Owen, British Fossil Mammals, 1846, p. 201. 



Not Mus amphibins Linnaeus, 1758. 



