1909.] THE CAYUGA LAKE BASIN, N. Y. 455 



A. A. Allen informs us that the young are brought forth a little 

 later probably than with the other squirrels, for on May g, 1908, 

 a female was secured which showed signs of recent suckling. 



362. Marmotta monax (Linnaeus). Woodchuck. 



Abundant throughout the basin in the more open and dry areas. 

 It goes into hibernation about the middle of November and is not 

 found abroad again until the first part of March, usually before the 

 first snows are melted. An adult male albino was taken during the 

 spring of 1876. On April 13, 1901, T. L. Hankinson shot a female 

 which contained three fetuses (one in the right and two in the left 

 horn of the uterus) 50 mm. in length. 



363. Sciuropterus volans volans Bangs. Southern flying squirrel. 

 Common throughout the basin wherever suitable hollows for 



nests or cover during the day are obtainable. The 3'oung are born 

 about the middle of April. 



86. Family Murid^. The Rats and Mice. 



364. Mus musculus Linnaeus. House mouse. 



Abundant in buildings, open fields and woods in the lowlands 

 about the head of the lake. 



365. Mus norvegicus Erxleben. Norway rat. 



Abundant. Found in the same abodes and areas as the preceding 

 species. During the winters of 1907-8 and 1908-9 there were three 

 instances of persons attacked while sleeping by individuals of this 

 species. 



366. Peromyscus leucopus noveboracensis (Fischer). Deer mouse. 

 Common throughout the basin. Breeding begins April 15 and 



continues until August. Mr. A. A. Allen observes : " Three to five 

 young about once a month for five or six months of the year, serves 

 to preserve the species." 



367. Peromyscus maniculatus gracilis (Le Conte). Canadian 

 white-footed mouse. 



This species is common on Turkey Hill and in Michigan Hollow. 

 It will undoubtedly be found on some of the other high hills when 

 search is made. 



