72 NORTH AMERICAN FAUNA. [No. 22, 



the specimen from Robinson Portage taken in September, except that 

 the fur of the back is tipped with whitish. The species, it is stated, 

 is locally called the 'beaver mouse,' from being found in the hous(;s of 

 the beaver. 



Sorex personatus I. Geoffroy. Common Eastern Shrew 



About twenty-live sjiecimens were collected from various localities 

 between Norway House and York Factory. These average lighter in 

 color beneath and slightly larger than specimens of pernoimtus in corre- 

 sjjonding jjclage from the Northeastern States. The males average a 

 little darker dorsally than the females. S<jmetimes there is a distinct 

 dark area on the back separated from the ashy of the lower parts 1)}' 

 a lighter lateral strijje. Among my specimens this dark area seems 

 to incr(>ase in intensity with ago, and a verj' old male with excessively 

 worn teeth from York Factory has a conspicuous tricolor pattern. 

 This specimen has an abnormally short tail and measures: Total 

 length '.»(); tail vertebrae ?>^2\ hind foot 12. Eight of the largest speci- 

 mens average: 104.1: ■Id.il; 12. 



King records a specimen of Son'x farxferi vfh.\Q\x was found near the 

 mouth of Great Fish K,i\er." 



Sorex (Microsorex) alnorum sp. nov. Keewatin Shrew. 



Type from Robinson Portage, Keewatin, Canada. 9 ad. (skin and skull), 

 No. 107014, U. S. Nat. J\[as., Biological Survey collection. Collected June 

 27, 1900, by Alfred E. and Edward A. Preble. Original number, 2662. 



Genera] eJtdraeters. — Larger than Sofe.r lioyi with larger skull ; lower 

 parts not tinged with buf^3^ 



(hhir. — Type: Upperparts sepia brown as in S. hoyi; lower parts 

 ashy gray, not tinged with.buffy; hind foot dusky on outer and whit- 

 ish on inner half; tail dusky above, whitish below, becoming dusky 

 toward tip. Compared with Sore.e {JL'ert/ao/vx) eriinius from Cook 

 Inlet, Alaska, the type is slightly darker above and slightly grayer 

 beneath. 



Skull. — Compared with skulls of S. hoyi from Elk River, Minne- 

 sota, and Red River Settl&pent, Manitoba, the skull of the type is 

 much larger; rostrum about the same; braincase much broader and 

 higher, both actually and proportionally; mandible longer and slen- 

 derer; teeth moi-e heavily pigmented. Compared with Sore,f {Mioro- 

 sorex) exaiiiui< from Cook Inlet, alnortiiii has rostrum slightly broader, 

 longer and higher; unicuspids more crowded. 



Mecifinreiiients. — Type: Total length 98; tail vertebrse 35; hind foot 

 12. Skull: Greatest length 16.5; width of braincase 7; length of 

 mandible 10. 



Remarlts. — We found this species only at Robinson Portage, where 

 the type was trapped, and on the Echimamish. At the latter point a 



"Narrative of a Journey to the Shores of the Arctic Ocean, II, p. 17, 1836. 



