1915.] 



MARMOTA FLAVIVENTEIS GKOUP. 



53 



44.7 (43.7); least interorbital breadth, 19-21.2 (20.2); breadth of 

 rostrum, 18.7-20.3 (19.6); maxillary tooth row, 14.9-20.5 (17.4). 



Remarks. — This form most nearly resembles luteola in color, but is 

 much redder (less yellowish) . Its skull also is much larger, agree- 

 ing rather with that of ohscura. It is known from only a few speci- 

 mens and its range has not been definitely determined. It probably 

 wiU be found throughout west-central Colorado and adjacent parts 

 of Utah. In both size and color it differs markedly from engelJiard'ti, 

 but additional material may show that the two forms intergrade. 

 Intergradation with luteola is indicated by a series of specimens from 

 Sulphur Springs (referred to luteola) , and with ohscura by a specimen 

 from Florida, Colo, (referred to ohscura). 



Specimens examined. — Total number, 11, as follows: 



Colorado: Crested Butte, 4;^ Cochetopa Pass (9 miles south), 1; Mud Springs, 

 Garfield County, 5;^ Sapinero, 1. 



MARMOTA FLAVIVENTRIS OBSCURA Howell. 

 Dusky Marmot. 

 (PI. II, fig. 2; PI. VIII, fig. 4; PI. XIV, fig. 4.) 

 Marmota Jlaviventer ohscura Howell, Proc. Biol. Soc. Washington, XXVII, 1914, p. 16. 



Type locality. — Wheeler Peak, 5 miles south of Twining, N. Mex. 

 (altitude, 11,300 feet). 



Distrihution. — Upper slopes of high peaks in northern New Mexico 

 and southern Colorado, from Pecos Baldy, N. Mex., north to Sierra 

 Blanca, vicinity of Fort Garland, and to San Juan Kange near Osier, 

 Colo, (formerly in the Manzano and Datil Mountains, N. Mex.) ; occurs 

 in Hudsonian and upper Canadian Zones from about 9,600 feet alti- 

 tude to the summits of the peaks (13,300-13,700 feet). 



Characters. — Size large (exceeding dacota and equolmg Jlaviventris) ; 

 sexes about same size; tail long; colors dark brown mixed with white, 

 with relatively little of the buff or tawny shades of other races; face 

 usually without white markings ; skull similar to those of warreni and 

 dacota. 



Color. — Adults: General tone of upperparts dark brown, grizzled 

 with white, becoming cinnamon on hinder back in some individuals; 

 underfur clove brown succeeded by pinkish buff, shading in some 

 specimens to pinkish cinnamon on hinder back and rump; long hairs 

 dark chestnut-brown, finely grizzled with white; head and face dark 

 chestnut-brown or black, grizzled with white on sides of face, rarely 

 with a whitish band across nose; sides of nose, lips, and chin, white 

 or buffy white; feet dark chestnut-brown often extensively mixed 

 with white or buffy hairs, or sometimes cinnamon-buff shaded with 

 dark brown; tail chestnut-brown, shading to blackish brown beneath; 



1 Three in collection E. R, Warren. 



* Four in collection E. R. Warren; one in Amer. Mns. Nat. Hist. 



