1915.] 



MAEMOTA FLAVn^NTEIS GROUP. 



49 



Utah: Blacksmith's Fork (near head), 1; Laketown, 1; Park City, Wasatch 

 Mountains, 3. 



Wyoming: Bighorn Mountains (Trapper's Creek), 6; Fremont Peak, 2; Jackson, 

 2; Kendall (12 miles north), 1; Lake Fork, Wind River Mountains, 3; Little 

 Sandy Creek, 3; Lost Cabin (15 miles northwest), 1; Pahaska, 1; Salt River 

 Mountains (10 miles southeast of Afton), 1; Sheridan, 1. 



MARMOTA FLAVIVENTRIS DACOTA (Merriam). 



Black Hells Marmot. 



(PI. IV, fig. 1; PL VIII, fig. 3; PI. XIV, fig. 2.) 



Arctomys fiaviventer Grinnell, Ludlow's Black Hills of Dakota, 1875, p. 82. (Not 



of Audubon & Bachman). 

 Arctomys dacota Merriam, N. Am. Fauna No. 2, 1889, p. 8. 

 [Marmota] dacota Trouessart, Cat. Mamm., Suppl., 1904, p. 344. 



Type locality. — Custer, S. Dak. 



Distribution. — Black Hills, S. Dak., and Bear Lodge Mountains, 

 Wyo., southwest to Bridger Pass, Wyo. 



Characters. — Size large (equaling jlaviventris) ; color similar to 

 that of nosofhora but underfur redder and less mixed with black; 

 skull large, with broad rostrum and very large palatal foramina. 



Color. — General tone of upperparts orange-cinnamon overlaid 

 with warm buff; underfiu- at base fuscous or dark mouse gray, 

 succeeded by pinkish cinnamon or vinaceous-cinnamon on fore back 

 and by orange-cinnamon on hinder back, darkening to kaiser brown 

 on sides (sometimes vinaceous-cinnamon to roots on fore back); 

 long hairs on fore back bright cinnamon-buff at tips with an indis- 

 tinct subterminal band of hazel or chestnut-brown; on hinder back 

 chestnut-brown or blackish brown, tipped with white; buttocks 

 warm buff; top of head and nose blackish brown with a band of 

 yellowish white across face in front of eyes; sides of nose, lips, and 

 chin, white or yellowish white; fore legs kaiser brown, feet russet; 

 hind feet hazel; tail above, hazel mixed with chestnut-brown; beneath, 

 blackish brown; underparts kaiser brown shaded with ochraceous- 

 buff. 



Slcull. — Similar to that of nosopliora but larger, with broad rostrum 

 and broad palatal foramina. 



Measurements. — Adult male:^ Total length, 610-680 (average 

 643); tail vertebrae, 178-200 (185); hind foot, 81-92 (85). Adult 

 female: 2 .525-627 (602); 130-188 (168); 79-84 (81). Slcull: Adult 

 male:^ Condylo-basal length, 89.4-95.7 (92.5); palatal length, 

 50.8-52.2 (51.6); postpalatal length, 35-38.2 (36.6) ; length of nasals, 

 37.8-41.1 (39); zygomatic breadth, 59.5-61.4 (60.7); breadth across 



1 Five specimens from Black Hills, S. Dak., and Bear Lodge Moimtains, Wyo. 



2 Five specimens from Black Hills, S. Dak. 



3 Three specimens from Black Hills, S. Dak., and Bear Lodge Moimtains, Wyo. 

 69168''— 15 4 



