92 The Ottawa Naturalist [September 



(1) The Bruce Peninsula is a migration route for land 



birds. 



(2) At the base at least, the wave of migration extends 

 clear across the peninsula. 



(3) Ducks and other waterfowl cross the peninsula at the 

 base from east to west in the spring. 



(4) The base of the Bruce Peninsula has its fauna tinged 

 with Carolinian tendencies as shown by the common breeding 

 of the towhee and wood thrush. 



A NEW MOUSE FOR CANADA. 



While spending a few days at Point Pelee at the end of May, 

 1907, I had some traps out and succeeded in taking a few speci- 

 mens of Peroniyscus Bairdi, a mouse which appears to be hither- 

 to unrecorded for Canada. Peromyscus is the deer mouse genus 

 and this little fellow bears considerable resemblance to the 

 common deer mouse of the woods, in being brownish red above 

 and white beneath, but the brown is darker and not so reddish, 

 and the greatest differences are in the length of ears, tail and hind 

 feet, all of which are smaller in this species than in the common 

 one (Peromyscus americanus) . 



The measurements of these mice do not accord exactly with 

 those given by Dr. Elliott in "Mammals of North America." 

 In that work P. Mickiganensis (synonym of P. Bairdi)is stated 

 to measure 165 mm.; tail vertebrae, 67; hind foot,20. 5 ; whereas 

 my three fully adult specimens average, 139; 49; 16.5, and a 

 specimen from Niles, Michigan, mieasures 136, 55, 18. 



The habitat of this mouse, so far as hereto known, is from 

 Michigan to Minnesota and south. Its habitat on Pt. Pelee is 

 peculiar. On the centre and the east side of the point I found 

 nothing but P. americanus while Baird's mouse was strictly 

 confined to the sandy beach on the west side, living among the 

 logs and other miscellaneous lumber such as are found on every 

 beach where they have been left by high water. 



I took one specimen at the edge of the red cedar thicket, but 

 the others were taken out on open beach beside the logs. The 

 inhabitants spoke of finding them frequently when taking wood 

 from, the Vjeach. The common deer mouse is found in the wooded, 

 parts of the point and its range overlaps that of Baird's niouse at 

 the edge of the wooded area, but the line of demarcation is 

 drawn with surprising distinctness. One of the specimens taken V 

 this year has been seat jto the Museum of the Geological Survey. 



x:^'--^L X^ ^_ p^_ Saunders. 



