16 Proceedings of the Biological Society of Washington . 

 Marmota flaviventer warreni* subsp. nov. 



WARREN'S MARMOT. 



Type from Crested Butte, Colorado. Adnlt female, No. 202,937, U. S. 

 National Museum (Biological Survey Collection); July 11, 1902, E. R. 

 Warren; original number, 35 (10,639, X catalogue). 



Characters. — Size large (equalling flaviventer or dacoia); colors deep 

 red with very little buff (much darker than luteola); skull larger than 

 that of dacota, with longer, slenderer rostrum and narrower palatal 

 foramina. 



Measurements. — Adult female (type) : Total length, 565; tail vertebrae, 

 131; hind foot, 82. Skull (type): Condylo-basal length, 89.3; zygomatic 

 breadth, 50; breadth of rostrum, 20.3. 



Remarks. — This race is the reddest of the forms of flaviventer. It is 

 apparently confined to western Colorado, but the limits of its range are 

 not definitely known. It intergrades with luteola on the north and with 

 obscvra on the south. It differs markedly, both in size and color, from 

 engelharJti, but material from eastern Utah will very likely show that 

 these two forms are connected by intergrades. Specimens have been 

 examined from Crested Butte, ilud Spirngs (Garfield Co.), Cochetopa 

 Pass, and Sapinero. 



Marmota flaviventer obscura subsp. nov. 



DUSKY MARMOT. 



Type from A\'heeler Peak, 5 miles south of Twining, New IMexico (alti- 

 tude 11,300 feet). Adult female. No. 133,50.5, U. S. National -Aluseuni 

 (Biological Survey Collection); July 24, 1904, V. Bailey; original num- 

 ber, 8181. 



Characters.— Si'/.e large (exceeding dacota and eqn-Ming flariBeiiler); 

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

 white, with little of the buff or tawny shades of the related races; face 

 usually without wliite markings; skull similar to that of dacota (that of 

 male about same size, of female larger) with narrower palatal foramina. 



Measurements.— Average <>i 3 adult males from Xew jNIexico: Total 

 length, 655; tail vertebrae, 204; hind foot, 90.7; average of four adult 

 females fr(jm same localities: 646; 190; 89.3. Skull: Adult female 

 (type): Condylo-basal length, 84.5; zygomatic breadth, 59.4; breadth of 

 rostrum, 22.3. 



liemarks. —Thk is the darkest and one of the largest of the races of 

 flarirenter. It occupies the upper slopes of the higher peaks, chiefly above 

 timber line, in northern Xew Mexico and southern Colorado, from the 

 Pecos River INIountains north to the Sangre de Christo and San Juan 

 Ranges, Colorado. Intergradatiou with warreni is indicated by an inter- 

 mediate specimen from Florida, Colorado. 



* Named for Mr. Edward R, Warren, whose extensive collection of Colorado mar- 

 mots has aided materially in clearing up the relationships of the group. 



