1915.] 



MARMOTA FLAVIVEiSTTElS GKOUP. 



39 



MARMOTA FLAVIVENTRIS FLAVIVENTRIS (Audubon & Bachman). 



Yellow-Bellied Marmot. 



(PI. Ill, fig. 2; PL VII, fig. 1; PI. XIII, fig. 1.) 



Arctomys flaviventer Audubon & Bachman, Proc. Acad. Nat. Sci. Philadelphia, 1841, 



p. 99; Quad. N. Am., Ill, 1853, p. 160, PI. CXXXIV. 

 [Marmotd] Jlaviventer TToue8S3i,Tt, Cat. Mamm. SuppL, 1904, p. 344. 



Type locality. — Mountains between Texas and California"; — 

 here fixed on Mount Hood, Oreg. (See remarks following, p. 40.) 



Distribution. — The Cascade Range in Oregon and the northern 

 Sierra in California, south to Lake Tahoe. 



Characters. —Size IsLige; general tone of upperparts russet, grizzled 

 with white, the fore back sometimes overlaid with a rather indistinct 

 buffy mantle; underparts ochraceous-buff to hazel; feet ochraceous 

 or hazel; skull massive. 



Color. — Underfur of upperparts deep mouse gray at base, suc- 

 ceeded by a broad area of buffy white, the latter shading on hinder 

 back to pinkish cinnamon (sometimes to hazel) ; long hairs chestnut- 

 brown or clove brown subterminally, tipped on fore back with light 

 buff, on hinder back with white; top of head and face chestnut- 

 brown to blackish brown, sometimes varied with cinnamon-drab, with 

 an indistinct band of buffy white or ochraceous-buff across face in 

 front of eyes; sides of face mixed chestnut-brown and cinnamon-buff; 

 sides of neck with large patches of light ochraceous-buff; fore legs 

 and feet tawny to hazel ; hind feet light ochraceous-buff more or less 

 varied with light hazel; tail hazel (fading to clay color), the bases of 

 the hairs and under surface natal brown, varying to chestnut-brown 

 or blackish brown; underparts ochraceous-buff, varying to hazel, 

 becoming light ochraceous-buff around base of tail, the bases of some 

 of the hairs indistinctly chestnut-brown; sides of nose, lips, and chin 

 white, often varied with ochraceous-tawny around nose and edged 

 with hazel or kaiser brown on throat. 



SlcuU. — ^Largest of any member of the group; relatively long and 

 narrow; nasals long, and narrow posteriorly; nasal branches of pre- 

 maxillae broad; postorbital constriction broad; rostrum long and nar- 

 row; palatal foramina narrow. 



Measurements. — Adult male from Donner, Cal.: Total length, 700; 

 tail vertebrae, 180; hind foot, 90. Adult female from Crater Lake, 

 Oreg.: 640; 170; 80. Adult female from Donner, Cal: 600; 170; 85. 

 SlcuU: Adult male :^ Condylo-basal length, 92.5-97.1 (average 94.5); 

 palatal length, 52.3-55 (53.8); postpalatal length, 37.6-38.2 (37.9); 

 length of nasals, 42.5-42.6; zygomatic breadth, 62.3; breadth across 

 mastoids, 41.1-46.2 (43.9); least interorbital breadth, 21.2-23 (22.1); 

 breadth of rostrum, 22.3-23 (22.8); maxillary tooth row, 19.5- 



1 Three specimens from Mount Hood, Oreg., and Fort Crook and Donner, Cal. 



