50 



NORTH AMERICAN FAUNA. 



[No. 37. 



mastoids, 42.3-44.7 (43.3); least interorbital breadth, 21.8-23.2 

 (22.6); breadth of rostrum, 22-23.6 (23); maxillary tooth row, 

 21-21.7 (21.4). Adult female: ^ Condylo-basal length, 81.4-84.5 

 (83.1); palatal length, 45.4-47.7 (46.8); postpalatal length, 31.6-33 

 (32.4); length of nasals, 31.5-35.5 (33.9); zygomatic breadth, 54.2- 

 56.7 (55.5); breadth across mastoids, 39.4-42.3 (40.5); least inter- 

 orbital breadth, 19.6-22.5 (20.6) ; breadth of rostrum, 20-22.3 (20.9); 

 maxillary tooth row, 20.1-20.5 (20.4). 



Remarks. — This form is the brightest of all the races of the species, 

 the red and yellow shades being most pronounced and the blacks 

 and browns reduced to a minimum. It is abundant in the Black 

 Hills and apparently ranges through eastern Wyoming to Bridger 

 Pass, intergrating with luteola in the Laramie Mountains. 



Specimens examined. — Total number, 19, as follows: 



South Dakota: ''Black Hills," 1; Custer, 8; Savoy, 5; Tigerville (near Hill 

 City), 1. 



Wyoming: Bear Lodge Mountains, 1; Bridger Pass, 3, 



MARMOTA FLAVIVENTRIS LUTEOLA Howell. 



Park Marmot. 



(PI. VIII, fig. 2; PI. XIV, fig. 3.) 



Arctomys fiaviventer Allen, Bui. Essex Inst., VI, 1874, p. 57. (Not of Audubon & 

 Bachman.) 



Marmota fiaviventer Warren, Colorado Coll. Pub., Sci. Ser., XI, No. 46, 1906, p. 243. 



(Not of Audubon & Bachman.) 

 Marmota engelhardti Cary, N. Am. Fauna No. 33, 1911, p. 98. (Not of Allen.) 

 Marmota fiaviventer luteola Howell, Proc. Biol. Soc. Washington, XXVII, 1914, p. 15. 



Type locality. — Woods P. O., in Medicine Bow Mountains, Wyo. 

 (altitude about 7,500 feet). 



Distribution. — Mountains of northern Colorado and southeastern 

 Wyoming, from Park County, Colo., (and probably Fremont County) 

 north to the Laramie Mountains, Wyo. 



Characters. — About the size of dacota and similar in color to it 

 and nosopJiora, but underparts yellowish instead of deep red, and 

 fore back overlaid with white instead of warm buff; skull similar 

 to that of nosophora, but averaging narrower. 



Color. — Normal phase: Underfur of upperparts dark mouse gray 

 at base (shading on hinder back to deep dusky drab), succeeded on 

 fore back by a broad area of warm buff and on hinder back by 

 ochraceous-buff ; long hairs blackish brown or dark chestnut-brown, 

 tipped with Hght buff or buffy white; top of head and nose blackish 

 brown, with a rather large patch of white or ochraceous-buff between 

 eyes; sides of face mixed brown and buff; sides of nose, lips, and 

 chin, white, yellowish white, or ochraceous-buff; sides of neck warm 



1 Five specimens from Black Hills, S. Dak. 



