492 Life-histories of Northern Animals 



COLOUR Above, grayish fawn colour, clearest or strongest on 



cheeks and rump, with a broad (over J inch) band along spine 

 from snout to hips, of darker gray sprinkled 

 with blackish hairs ; under-fur every- 

 where plumbeous, which is the colour also 

 of hind legs on outer side. All below, 

 FiG.i4s-HeadofDeermouse purc whltc j tall, blcolourcd sharply, pure 



showing the cheek pouches ,. |, . "Illl 1 



distended. Altogether the whitc bclow, browuish blacK aDOvc; a 



pouches contain 14 of the 



Ihtp-lfi^uit^^^TthrbLI slight tuft on end. 



River, May, ,907 g^^^g ^j|j^g . yQuug, slatcy above, and 



until nearly full grown. Our three races may be thus 

 characterized : 



arcticus, as above; differs from the typical manicu- 

 latus chiefly in its much shorter tail. It is a 

 woodland form. Size: 7I; 3^; J inches. 



bairdi is smaller, much more slender than arcticus, 

 and darker, having always a very dark or nearly 

 black band down the back. It is a prairie form. 

 Size: 5I; 2; | inches. 



nebrascensis differs from arcticus in being much 

 paler, the buffy or yellow is very pure, especially 

 on the hindquarters, and is greatly extended so 

 that it covers nearly all the body, leaving little 

 or no dark dorsal band. It is a Plains form. 

 Size 6|; 2^^; if inches. 



When alive nebrascensis strikes one as a golden-brown 

 mouse; bairdi as a black mouse; arcticus as a gray mouse. 



At Carberry Lgot specimens that were related toall three, but 

 also some that were nearly true bairdi. Specimens from Kenora, 

 Ingolf, Winnipeg, and Winnipegosis are almost typical arcticus.^ 



Life-history. 



The northern Deermouse {arcticus) is generally distributed 

 in north-eastern Manitoba, and is the dominant form in the 

 Province. Its range is shown on Map No. 27. 



^ While this volume was in press Osgood's monograph of the genus Peromyscus 

 appeared. This work makes it seem probable that true maniculalus is the form in 

 north-eastern Manitoba. 



RANGE 



