so NORTH AMERICAN FAUNA. [No. 22, 



to make it reasoiml)ly certain that they are all referable to the same 

 form. In detailed measurements the two series agree A'ery well. 



Seven adults from Painted Stone Portage average: Total length 

 186; tail vertebrii; '.»i'; hind foot 20. Average of seven adults from 

 Oxford House: 186, '^■2, 20. Average of seven adults from York 

 Factory: 1S;3, 91, 20.7. This mouse constitute^ the hou.se mouse of 

 the region, and infests all the houses and stores within its range. 



At York Factory almost all our specimens were taken in or about 

 the post buildings; the animal seemed to be rare in the surrounding 

 swamps. 



[(?) Neotoma drummondi (Richardson). Drummond '\A"ood-Rat. 



A wood-rat received aliout 18(10 from ^X. MacTavish, and supposed 

 to have been taken at Fort Churchill," is in the U. S. National Museum. 

 It was mounted for many j-ears. l^ut is now made into a study skin. 

 The color has become so changed by exposure that no dependence can 

 be placed on it, and the skull lacks the greater part of the braincase 

 and is otherwise defective. Comparison of this imperfect specimen 

 with specimens talvcn at Jasper House in the type region of drujinnondi 

 shows no essential difi'erences. As Jasper House seems to be the nearest 

 point to Fort Churchill that the genus XeotoiiiK has been recorded, 

 and as the animal is unknown to the inhabitants of Fort Churchill, it 

 seems most likely that the specimen came from some point in the 

 interior, and was erroneously included in a lot of sjDecimens from 

 Hudson Bay.] 



Thenacomys mackenzii Preble. Mackenzie Phenacomys. 



Fhenacomys mackmzli Preble, Proc. Biol. Soe. Wash., XV, p. 182, August 6, 1902. 

 (Fort Smith, Mackenzie.) 



Found onl^' at Fort Churchill, where an adult female and two imma- 

 ture indi\iduals were secured July 26 to 28. Two of these were taken 

 on a dry hummock in the meadow west of the post, and the third in a 

 grassy place among the rocks. The rostral portion of a skull, with 

 ■SL part of the skin attached, was found in a fissure among the rocks, 

 where the animal had evidentlj' been eaten by a v.easel. 



Ivotomys gapperi (Vigors). Common Red-backed Mouse. 



We found this species to be rather common throughout the region 

 between Norway House and Hudson Bay, and took a large series 

 embracing siaecimens from the following localities: Norway House, 

 Sea Falls, Echimamish River, Robinson Portage, Pine Lake, near head 

 of Oxford Lake, Oxford House, Knee Lake (near outlet and on island 



.«In a letter to Sir John Eichardson, extracts of which were published. Professor 

 Baird says: "Fi-om * * * our othernorthern collectors and correspondents we 

 have already received many interesting specimens, though the liest are still on the 

 way. We have already had Neotoma cinerca from Fort Churchill." (Edin. Isew 

 Phil. Journ. (new ser.), XIII, p. 164, 1861.) 



