IG Proceedings of the Biological Society of Washington. 
Marmota flaviventer warreni* subsp. nov. 
WAKRKN’S MARMOT. 
Ti/ye from Crested Butte, Colorado. Adult f(uual(', No. 202,9:17, U. S. 
National Afuseuin (Biological Survey Collection); July 11, 1902, E. B. 
Warren; orioinal munber, 3;) (10,039, N catalf)Rue). 
Characters. —Size larj^e (eciualling flaviventer or dacota)\ colors dee]) 
red vitb vei’y little bull'(inucb darker than tuteola); skull larger than 
that of dacula, with longer, slenderer I’ostrnni and narrower ])alatal 
foramina. 
Measurements. —Adult female (tyjie): d^otal length, 50o ; tail vei’tebiae, 
131; bind foot, S2. NA-a/( (tyix'): Condylo-basal length, S9.3; zygomatic 
breadth, 59; breadth of rostrum, 20.3. 
Remarks.— race is the re<ltlest of the forms of flaviventer. It is 
apparently conlineil to western (Colorado, but the limits of its range are 
not delinitely known. It intergrades with luleola on the north and with 
ohsevra on the south. It differs markedly, both in size and color, from 
engelhardti, hut material from eastern Utah will very likely show that 
these two forms are connected by intergrades. Specimens have been 
examined from Crested Butte, AInd S])irngs (Garfield Co.), Cochetopa 
Pass, and Sai)inero. 
Marmota flaviventer obscura snhsp. nov. 
DUSKY IMARMOT. 
Type from Wheeler Peak, 5 miles sonth of Twining, New IMexico (alti¬ 
tude 11,:100 feet). Adult female. No. 1:13,505, U. S. National JMnsenm 
(Biological Survey Collection); July 24, 1904, V. Bailey; original num¬ 
ber, 8181. 
Characters. —Size large (exceeding dacota and equuWing flaviventer); 
.sexes ahont the same size; tail long; colors dark brown mixed with 
white, with little of the huff or tawny shades of the related races; face 
usually without white markings; skull similar to that of dacota (that ol 
male ahont same size, of female larger) with narrower palatal foramina. 
Measurements. —Average of 3 adult males from New INIexico; Total 
length, 055; tail vertebrae, 204; hind foot, 90.7; average of four adult 
females from same localities; 040; 190; 89.3. Skull: Adult female 
(type): Condylo-hasal length, 84.5; zygomatic breadth, 59.4; ))readth of 
rostrum, 22.3. 
Remarks. —This is the darkest and one of the largest of the races of 
flaviventer. Itoccn])ies the upper slopes of the higher peaks, chiefly above 
timber line, in northern New INIexico and southern Colorado, from the 
Pecos River Mountains north to the Sangre de Christo and San Juan 
Ranges, Colorado. Intergradation with warreni is indicated l)y an inter¬ 
mediate si)ecimen from Florida, Colorado. 
*Nani()d I'oi' Mr. Edward R. Warroii, wlif)se extensive collection of Colorado mar¬ 
mots lias aided materiall.v in clearing up the relationships of the group. 
