30 The Ottawa Naturalist. [May 



genus going into the synonomy. This would be practically the 

 position of Salter except that we would use Cryptolithus for 

 Trinudeus, and Trinudeus for Tretaspis. 



Fourth, use the three names, Cryptolithus for the type of 

 tessellatus and caractaci, Trinudeus for fimbriatus and its allies, 

 and Tretaspis for seticornis and the like. 



ZAPUS PRINCIPS MINOR. 



A New Mouse Record For Manitoba. 



The mouse whose name appears above was one of a small 

 collection recently determined through the courtesy of Dr. H. 

 W. Henshaw, of Washington, who informs me that its capture 

 at Aweme, Manitoba, constitutes, not only a record for the 

 Province, but also extends the known range of this rodent 

 considerably further eastward. As a matter of fact, however, 

 these mice appear to be the usual race met with in south-western 

 Manitoba, as we have yet to discover any other. They are found 

 not infrequently on the edges of woods among low bushes and 

 occasionally in tall grass in open situations. 



Like other members of the genus, they are by no means 

 easy to capture and their long jumps (from five to seven feet) 

 combined with their habit of doubling, often completely mystify 

 a dog, as they would doubtless a coyote or fox; besides this they 

 have an instinctive knowledge of their colour resemblance to 

 the surrounding objects and so, after a few puzzling leaps, will 

 crouch down and remain perfectly motionless until danger 

 seems past, when they creep silently away. This is when they 

 have strayed from their burrows. When their homes are at 

 hand they quickly vanish beneath the ground. 



Zapus princips minor may be described briefly as follows: 

 length 219 mm., tail vertabrae 131, hind foot 30: colour agaty, 

 sides ochraceous, moderately covered with black tipped hairs; 

 lower parts yellowish with a slight tinge of pink fading to white 

 beneath. It resembles closely other species of the genus, partic- 

 ular^ Z. hudsonius campestris, from which it differs, however, 

 in being slightly smaller and more brightly coloured. 



But one of these mice has previously been recorded for 

 Manitoba, namely Z. hudsonius, the type locality for which is 

 Hudson's Bav. Probably at least one other campestris 

 will eventually turn up within our boundaries, and since the 

 extension of the Province to Hudson's Bay, others may well be 

 discovered in the north country. Stuart Criddle. 



