80 



NORTH AMEEICAIT FAUNA. 



[No. 37. 



female: 1 496-556 (528); 102-147 (126); 75-80 (78.6). SluU: 

 Adult male: ^ Condylo-basal length, 82.5-87.4 (85.1) ; palatal length, 

 48.5-51.2 (50); postpalatallength, 30.6-33 (31.7); length of nasals, 

 31.5-35.6 (34.1); zygomatic breadth, 57.5-63.4 (60.5); breadth 

 across mastoids, 40.6-44 (41.7); least interorbital breadth, 24-26.8 

 (25); breadth of rostrum, 18-20.3 (19.2); maxillary tooth row, 19.9- 

 20.8 (20.4). Adult female: ^ Condylo-basal length, 79.7-84.4 (82.2) ; 

 palatal length, 47-49.4 (48.2); postpalatal length, 29.2-31.7 (30.6); 

 length of nasals, 31.3-34.2 (32.6); zygomatic breadth, 55.4-58.7 

 (57.1); breadth across mastoids, 39-41.5 (40.6); least interorbital 

 breadth, 22.5-25 (23.8); breadth of rostrum, 17.6-19.7 (18.7); max- 

 illary tooth row, 19-20.4 (19.9). 



Remarks. — The Labrador woodchuck is a strongly marked form of 

 the monax group, much larger and darker than canadensis, its nearest 

 neighbor. Indeed, it might be considered a distinct species were it 

 not practically certain that the ranges of ignava and canadensis are 

 contiguous and that more material from the region between Murray 

 Bay and the Straits of Belle Isle would show intergradation. In 

 color and size the present form more closely resembles rufescens than 

 canadensis and the skull is more like that of preUorum than that of 

 any other form, but ignava is much darker than preUorum. The 

 subspecies is reported to be common on the coast in the vicinity of 

 Black Bay, and is said to be found about the head of Hamilton 

 Inlet,2 but the limits of its range are not kno^^m. Stearns reports 

 woodchucks ^'common at Mingan, growing scarce toward Bonne 

 Esperance." ^ 



Specimens examined. — Total number, 15, as foUows: 



Labrador:^ Ailik, Peter's Cove, 1; Black Bay, 4; L'Anse au Loup, 10. 



MARMOTA MONAX CANADENSIS (Eexleben). 



Canada Woodchuck. 



(PL VI, fig. 1; PL XI, fig. 4.) 



[Glis] canadensis Erxleben, Syst. Regn. Anim., 1777, p. 363. 

 3Ius empetra Pallas, Nov. Spec. Quad., Glir. Ord., 1778, p. 75. 

 Arctomys sihila Wolf, Linne's Natursyst., II, 1808, p. 481. (Name proposed to include 

 Arctomys empetra Pallas and Arctomys pruinosa Gmelin, supposed to be the same). 

 Arctomys melanopus Kuhl, Beitrage, 1820, p. 64. 

 Arctomys marmota canadensis Kuhl, Beitrage, 1820, p. 64. 



Arctomys empetra Sabine, Trans. Linn. Soc. London, XIII, 1822, p. 584; Richardson, 



Fauna Boreali-Americana, I, 1829, p. 147. 

 Arctomys monax melanopus Rhoads, Proc. Acad. Nat. Sci. Philadelphia, 1897, p. 30. 

 Arctomys monax canadensis Allen, Bui. Amer. Mus. Nat. Hist., X, 1898, p. 456. 

 [Marmota monax] canadensis Trouessart, Cat. Mamm., SuppL, 1904, p. 344. 



1 Six specimens from vicinity of type locality. 



2 Low, A. P. Ann. Rept. Geol. Surv. Canada, VHI, 1895 (1897), p. 320L. 



3 Steams, W. A. Proc. U. S. Nat. Mus., VI, 1883, p. 115. 



4 All in collection Mus. Comp. Zool. 



