neio S'pecies of Water- Shreiv. 373 



collection of specimens representing the family Soricida3 in 

 the Zoological Museum of the Imperial Academy of Sciences 

 at St. Petersburg, which, owing to the kindness of Dr. Strauch, 

 I have been enabled to examine. 



Sorex liydrodromus. 



Scarcely larger than S. m in ut us, and therefore much smaller 

 than >S'. palustris, which it also ditlers from in dentition, but 

 resembles in the fringed condition of the digits of the manus 

 and pes. Tlie tail is nearly as long as the head and body and 

 is clothed rather thinly with moderately long hairs, which do 

 not form a fringe ; in the form of the muzzle and ears there 

 is nothing peculiar or different from that of S. viinutus ; the 

 feet, however, differ remarkably in the possession of fringes to 

 the digits both of the manus and pes, as well as or even better 

 developed than in Crossopus fbdiens ; a thick comb-like fringe 

 of stiff hairs also extends along the outer and inner margins 

 of both manus and pes, being especially dense and well deve- 

 loped along the outer margins. 



Fur reddish brown above, yellowish brown beneath ; cXnn, 

 throat, and chest with greyish-tipped hairs ; the base of tlic 

 hairs both above and beneath dark bluish grey. 



The teeth closely resemble those of ^S'. vulgaris ; as in that 

 species the third incisor is the largest and longest of the uni- 

 cuspidate teeth ; the first max- 

 illary tooth is very nearly 

 equal to the second incisor and 



quite intermediate in size be- \ 



tvveen the third incisor and the V 



second maxillary tooth ; the 

 third maxillary tooth is even 

 more internal than in 8, vul- 

 garis^ in this respect resem- 

 bling the American represen- 

 tatives of that species, and its long axis is at right angles to 

 the direction of the jaw, its inner and posterior convex margin 

 fitting into the concavity on the inner and anterior side of the 

 fourth maxillary tooth. The mandibular teeth closely re- 

 semble those of S. vulgaris. 



Length : head and body 53 millim. ; tail 4(3 ; eye from end 

 of muzzle 9^ ; ear, length 6^ ; elbow to end of middle digit, 

 without claw, 13^ manus 6, pes 13 ; distance between tips of 

 first upper incisor and last premolar 3^. 

 Hub. Uualaska Island, Aleutian Islands. 



