122 Copeland and Church — Mammals of Grand Manan. 



nicus. As the validity of this subspecies is soniewliat questioned, and rests 

 principally on size, the following table of measurements may be of interest. 

 Both body and cranial measurements of the Grand Manan specimens are 

 strikingly close to those of gymnicus from the mainland. 



Average Measurements of Adult Sciurus Jmdsonicus gyinnicas. 



SKULLS. 





43.5 

 43.2 



43 7 

 4.3.3 

 43.0 



Basilar length. 



34.2 (7 specimens) 

 33.7 



Zygomatic 

 breadth. 



25.1 (6 specimens) 

 24.6 



8 Grand Manan. N. B. 



8 Perry, Me. Coll. of Morton 



Jj. (Church. 

 12 Upton, Oxford Co., Me. I 



5 South Twin Lake, Me. + 



6 Trousers Lake, N. B. t 



Peromyscus canadensis argentatus subsp. nov. 



GRAND MANAN WHITE-FOOTED MOUSE. 



Tg})e from Grand Harbor, Grand Manan, New Brunswick. Adult 6^. 

 No. 108, coll. of Manton Copeland, Taunton, Mass. Collected September 19, 

 1905, by Morton L. Clmrch and Manton Copeland. 



Distribution. — Island of Grand Manan, New Brunswick. 



Characters. — Resembles most closely Peromyscus canadensis abietorum, but 

 differs decidedly and constantly, and is easily distinguishable. The color 

 of upper parts is close to slate-gray, and lacks almost completely the dull 

 russet of abietorum ; dark patch in front of eye pronounced. 



Measurements of body and skull average somewhat greater than those of 

 abietorum. 



Color. — Type : Upi)er parts slate-gray due to the presence of black-tip]>ed 



and gray-tipped hairs; mid-dorsal line slightly darker; a few russet-tipped 



hairs, most abundant on sides and at base of tail ; dark patch in front of 



eye more prominent than in abietorum,; underparts white, hairs [ilumbeous 



at base ; hands and feet white; tail sharply bicolor, black dorsally, white 



ventrally. 



* Bangs, O., Proc. Biol. Soc. Wash., X, p. 160, Dec. 28, 1906. 



t Allen, J. A., Bull. Amor. Mus. Nat. Hist., X, pp. 255-256, .Inly 22, 1898. 



I Bangs, ()., Proc. New Kng. Zoiil. Club, I, pp. 27-29, March 31, 1899. 



jJ Thomas, O., IToe. Biol. Soc. Wash., XVIII, pp. 191-196, Sept. 2, 1905. 



II Allen, J. A., Mon. N. Amer. Rod., p. 688, 1877. 



