efthe District of Montreal. 303 



DO ear pouches ; fore feet 4-dactyle, a wart with an obtuse nail in 

 place of a thumb ; hind feet 5-dactyle ; tail long, naked and scaly, 



M, decumanus. Common rat. 

 M. sylvestris of Brisson I 

 M. Norvegicus of Idem I 



v.s.M. Length about 9 inches; colour light brown above, 

 greyish white beneath ; tail nearly as long as the body ; feet 

 naked, dirty flesh colour ; tail scaly with stiff scattered hairs.* 



M. musculus. Common mouse. 



M. sorex of Brisson ! 



M. domesticus vulgaris of Ray ! 



V. s. M. Length about 3 J inches ; tail about the same length. 

 Fur dusky, grey above, ash coloured beneath ; fore feet 4-dactyle, 

 with a rudimentary thumb, clawless ; hind feet 5-dactyle, naked. 



M, agrarius. Common field mouse. 

 M. leucopus of Rafinesque ! 

 M. sylvaticus of Forster I 

 Hesperomys leucopus. Baird ! 



v.s.p. Length of head and body 3 inches, V lines ; of tail 

 2 inches, 3 lines ; of ears 2 lines. Colour mixed, dusky and fer- 

 ruginous, along the back, with yellowish or reddish-brown sides ; 

 cheeks lighter almost rufous ; upper lip, a space on each side of the 

 mouth, chin, throat and belly, with the inner surface of the ex- 

 tremities white ; tail not scaly, hairs short, appressed,streaked with 

 black along the dorsum, all the other surface white ; head large 

 and long ; ears large, erect and membraneous ; snout obtuse, and 

 sparingly covered with short appressed hairs ; eyes moderately 

 large ; whiskers long, black and white. Supposed by Tennant to 

 be a variety of the European field mouse. 



Suh genus Gerbillus, 



Sub gen. char. Incisors |, canines none, molars || = 16. 



Molars tuberculous ; first with three, second with two, and third 



■with one tubercle. Ears si^aller than in the last sub genus ; fore 



* Another species, the Mus rattus, has been also killed in Montreal, 

 undoubtedly an introduced species. The author has never seen but one 

 specimen of it,which was a stuflFed one in the possession of the Museum of 

 McGill College, and which was trapped in a merchant's store in this 

 city. It differs from the former only in the colour of its pelage which 

 is blackish. 



