﻿58 



NORTH AMERICAN FAUNA. 



[No, 10. 



whole becomes broader, shorter, and flatter, and in some sx)ecies a low 

 sagittal ridjne is developed. The brain case and palate broaden meas- 

 urably, and the arcli of the brain case falls away. The molar teeth 

 wear obliquely, so as to take on an ap])earance of greater breadth, and 

 the long middle incisors not only wear oft in front but turn down at a 

 rigiit angle to the cranial axis (see PI. XI). Hence, in comparing 

 skulls and teeth of related forms it is of the utmost importance to use 

 specimens of approximately the same age. 



Much labor has been expended upon the plates of Shrew teeth that 

 accompany this paper, but they are not camera lucida drawings and 

 can not be relied upon for small details. 



List of American forms of Sorex, iviih type localities and nuniher of specimens exanrincd. 



Name. 



Tyi)e locality, 



Sorex jJersonatits i 



streatori nob . . 



obscums 



veittralis nob . . 

 lonijicauda nob 

 cdascensis nob . 



oreopolus 



I'lchardsoni 



sphagnicola 



fumeus 



vagrans 



dobsoni 



monticola 



amoenv.s nob 



Vancouver ensis nob. 



orizabce nob 



nevadensis nob 



ornatus nob 



califoniic.is nob 



tenellas nob 



nanus nob 



pribilofensis nob ... 



me mam I 



bairdi nob 



troichridgii 



montereyensis nob 



macrodon nob 



ver cepacia 



saussurei 



caudatus nob 



longirostris 



fisheri nob 



jyacifici'n 



Subgenus 2Iicrosorex: 



hoyi 



Subgenus Xeonorex: 



paluntris 



navigator 



albibarbii) 



hydrodromus 



Subgenus Atophyrax: 



bendini 



palmeri nob 



albivenfer nob 



Eastern United States (exact locality 

 unknown). 



Taliutat, Alaska 



Salmon River Mountains, Idabo 



Cerro San Felipe. Oaxaca, Mexico I 



Wrangel, southeast Alaska ! 



Takutat Bay, Alaska : 



Sierra Xevada de Colima, Jalisco, Mexico. 



Probably plains of Saskatchewan, Can- 

 ada. 



Fort Liard, British Columbia 



Peterboro, Madison County, N. Y 



Shoal water Bay, Washington 



Saw Tooth Mountains, Idaho 



San Francisco Mountain, Arizona 



Mammolli Pass, Sierra Nevada, Calif 



Goldstream, Vancouver Island, B. C 



Mount Orizaba, Puebla, Mexico 



Reese River Valley, Nevada 



San Emigdio Canyon, Mount Pinos, Calif - 

 Walnut Creek, Contra Costa County, Calif . 

 Alabt^ma Hills, Owens Valley. California. 



Estes Park, Colorado 



St. Paul Id., Pribilof Islands, Bering Sea. 



Fort Custer, Mont 



Astoria, Oreg 



do 



Monterey, Calif 



Orizaba, Vera Cruz, Mexico 



Coban, Guatemala j 



Sierra Nevada de Colima, Jalisco, Mexico, j 



Reyes, Oaxaca, Mexico ' 



Santee river. South Carolina ; 



Dismal Swamp, Virginia ' 



Mouth, of Umpqua River, Oregon \ 



Racine, Wis 



Between Hudson Bay and Rocky Mts. . . 



Probably northern Idaho' 



Protile Lake, Frauconia ilountains, N. H 

 Unalaska Id., Alexrtian Islands. Alaska.. 



No. of 

 speci- 

 mens. 



2,;5 



.'56 

 175 

 21 

 48 

 27 

 3 



114 



2 

 27 

 104 

 46 

 9 

 7 

 1 



18 

 4 

 7 

 7 

 3 

 4 

 5 

 1 

 9 

 19 

 33 

 10 

 5 

 24 

 41 

 3 

 5 

 13 



23 



9 



Klamath Basin, Oregon 



Astoria, Oreg 



Olympic Mountains, Washingtcm 



1 See page 92, footnote. 



