508 Life-histories of Northern Animals 



This species is dichromatic, that is, it appears in two 

 colourations, one the normal, as above, the other the dark 

 "freak," much grayer in general and the back stripe sooty, 

 instead of red. 



The slender form, long tail, rufous-tipped ears and bright 

 colours of the animal will distinguish it from the neighbour- 

 ing species. 



The following races are recognized: 



gapperi Vigors, the typical form. 

 ochraceus Miller, larger and duller-coloured. 

 rhoadsi Stone, like gapperi, but darker-coloured, with 



shorter tail and larger hind-foot. 

 athahascce Preble; size of gapperi, with lower parts 



lighter and face grayer. 

 loringi Bailey, a very small, bright-coloured form. 

 galei Merriam, like gapperi, but paler, and with 



longer tail. 

 saturatus Rhoads, larger, and longer-tailed than 



gapperi. 



Life-history. 



RANGE The Gapper Mouse, originally described from Yonge 



Street, north of Toronto, Ont., has been found in graded 

 forms across the Continent to British Columbia. I got speci- 

 mens at Kenora, Winnipeg, and Carberry. E. A. Preble also 

 found it^ "rather common throughout the region between 

 Norway House and Hudson's Bay." Kennicott took a few 

 along Red River.^ Coues, in his Monograph of Muridae, 

 records^ it from Minnesota. Agassiz brought three specimens 

 from Lake Superior.^ Bailey records^ others from various 

 parts in Minnesota and Dakota, including Pembina. Thus 

 all of Manitoba falls within the proper range of this Mouse. 



' N. A. Fauna, No. 22, 1902, pp. 50-1. 



* Quad. III., Pat. Off. Rep. (for 1857), 1858, p. 89. 



' Monogr. Rod. Muridae, U. S. Geol. Sur. Ten, 1877, p. 145. 



* Ibid. = Rep. Cm. U. S. Dep. Agr. (for 1887), 1888, p. 444. 



