58 NORTH AMERICAN FAUNA. [No. 22, 



length (incisor to occipital cond3'le) 28.3; zygomatic breadth iy.2; 

 interorhital breadth 4; mastoid breadth 14.4. A large skull measures: 

 Ba'^al length 29; zygomatic breadth 20; interorbital breadth 4; mastoid 

 breadth 1.5. 



This lemming has been several times recorded from this region, 

 usually under the name Afoicolu hwlwiuav. J. C. Ro,ss reported it 

 from Port Bowen, Prince Regent Inlet/' and obtained specimens from 

 Boothia Felix, where it was active throughout the winter;* Richardson 

 states that it inhabits ^lelville Peninsula;'' specimens were taken bj^ 

 Parry's party on Melville Island on June 13, on which date the pelage 

 was turning brown; ^^ and Lyon observed it on Duke of York Bay, 

 Southampton Island.* Rae says, probably referring to this species: 



Occasionally large numbers of lemmings are found drowned along the shores of 

 James's Bay, but as they are generally seen after a very high tide, it is uncertain 

 whether they are then migrating, or merely caught by the high tide on their native 

 grounds./ 



Zapus hudsonius (Zimm.). Hudson Bay Jumping Mouse. 



We took Zapus at Norway House, on Echimamish River, at Rob- 

 inson Portage, at Oxford House, on Steel River (near the mouth 

 of the Shamattawa), and at York Factory. It was especiall}' common 

 in the grassy thickets about Oxford House, where the greater part 

 of the series was taken. At York Factory our traps yielded but two 

 specimens, and at Fort Churchill none, though at the latter place we 

 obtained an imperfect skin from the natives. The last one taken was 

 trapped on Steel River near the mouth of the Shamattawa August 

 31. At Oxford House, where these jumping mice had been ^ery plen- 

 tiful in July, we set out traps on September 10 and 11 in the same 

 places as before, without success; but as heaAV frosts had occurred for 

 some time it is probable that the animals were hibernating. An adult 

 female taken at Oxford House June 30 is suffused above with buffy 

 clay color and is lighter and less bright than the others secured; but 

 the series taken as a whole agrees essentially in color with a series 

 from northern Minnesota, and no differences are noticeable in the 

 skulls. Six adults from Oxford House average: Total length 209.3; 

 tail vertebra' 126; hind foot 30.3. Two from York Factory average: 

 212; 129.5; 30. Embryos from five to eight in number were noted in 

 several instances. 



Zap II X hiidvoiiius was originally described from a specimen sent from 

 Hudson Bay, probalily from Severn River, by Mr. Graham. It has 

 been recorded from James Bay and Fort Churchill. c 



"Parry's Third Voyage. Appendix, p. 93, 182-t. 

 ''Appendix to Ross's Second Voyage, p. xiv, 1S3.5, 

 <■ Fauna Boreali-Amerieana, \t. 132, 1829. 

 ''Journal of Parry's (First) Voyage, p. 202, 1821. 

 « Lyon's Private Journal, p. 47, 1824. 

 /Journ. Linn. Sue. London, Zool., XX, p. 144, 1888. 

 !/ Preble, N, A. Fauna, No. 15, p. 17, 1899. 



