﻿94 



NORTH AMERICAN FAUNA, 



[Xo. 10. 



and the molarifonn teeth less deeply excavated i)Osterioiiy. In size the 

 skull and teeth are intermediate hetween jicdiistris and navigator. 



j\Icasuye)neuts. — Average of 2 specimens from type locality (Profile 

 Lake, New Hami)shire) : Total length, 153 mm. ; tail vertebrae, CG.G mm. : 

 hind foot, 19 mm. Average of 7 specimens from Elizabethtown, K. Y. : 

 Total length, 154.7 mm.; tail vertebri^e, 71.3 mm.; hind foot, 19.3 mm. 



General remarls. — In winter pelage the under parts are less clouded 

 than in summer and the resemblance to S. is correspondingly 



closer. The two may be found to intergrade in the region north of 

 Lakes Huron and Superior. 



Specimens examined. — Total number, 5, from the following localities: 



New Hampshire : Profile Lake (tyjie locality), 1. 



New York: Elizabethtowu (east side of Adirondacks), 2. 



Penusvlvania : Busbkill Creek, Monroe County, 1. 



Canada: Godboiit, Province of Quebec (north shore of ►St. Lawrence), 1. 



SOREX HYDRODROMUS Dobson. 



Sorex hydrodromus Dobson, Annals and Magazine Nat. Hist.. 6th ser. IV, 372-374, 

 fig., November, 1889. 



Ti/pe locality. — Lnalaska Island, Aleutian Islands, Alaska. 



General characters. — Size small (hind foot, 13 mm.); third incisor 

 larger than fourth; both fore and hind feet fringed on both sides. ''A 

 thick comb-like fringe of stiff hairs extends along the outer and inner 

 margins of both manus and pes, being especially dense and well 

 developed along the outer margins.'' 



Color. — ''Fur reddish brown a*bove, yellowish brown beneath; chin, 

 throat, and chest with grayish-tipped hairs; the base of the hairs both 

 above and beneath dark bluish gray." ^ 



Dental characters. — ''The teeth closely resemble those of JS. vulgaris; 

 as in that species, the third incisor is the largest and longest of the 

 unicuspidate teeth; the first maxillary tooth is very nearly equal to 

 the second incisor and quite intermediate in size between the third in 

 cisorand the second maxillary tooth; the third maxillary tooth is even 

 more internal than in >S'. ndgariSj in this respect resembling the Ameri 

 can representatives 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 sides of tlie fourth maxil- 

 lary tooth. The mandibular teeth closely resemble those of S. vulgaris.''^^ 



Measurements. — Length: Head and body, 53 mm.; tail, 46 mm.; 

 eye, from end of muzzle, 9i mm. ; ear, length, 6^ mm. ; elbow, to end of 

 middle digit, without claw, 13 mm. ; manus, 6 mm. ; pes, 13 mm. ; dis- 

 tance between tips of first upper incisor and last i^remolar, 3^ mm."* 



General remarl's. — This interesting aquatic Shrew was described by 

 Dr. Dobson from a si)ecimen in the Museum of the Imx)erial Academy 



'Dobson, Annals and Magazine Nat. Hist., 6th ser., IV, 373, November, 1889. 



