1915.] 



MARMOTA CALIGATA GROUP. 



67 



white patches; hind feet black, more or less mixed with cinnamon; 

 underparts white, sparingly mixed on abdomen with cinnamon-buff; 

 tail above, mixed pinkish cinnamon and chestnut-brown; beneath 

 clove brown or blackish brown. Young (specimen from Elk Summit, 

 Idaho) : Nearly pure white above, shading to cinnamon-buff on hinder 

 back; the underfur dark mouse gray; tail cinnamon-buff fringed at 

 tip with blackish brown, the bases of hairs hair-brown; feet and top 

 of head fuscous-black. 



SlcuU. — (Known only from females.) Closely similar to that of 

 oxytona, possibly averaging a little shorter; much larger and relatively 

 narrower than that of okanagana, with broader rostrum. 



Measurements. — Young adult male from type locality: Total length, 

 755; tail vertebrae, 250; hind foot, 110. Adult female 700-820 

 (average, 751); 200-245 (224); 95-113 (105). Slull: Adult female:^ 

 Condylo-basal length, 99.5-106.5 (102); palatal length, 58-61.4 



(59.4) ; postpalatal length, 37.5-39.6 (38.2); length of nasals, 40.6- 

 43.9 (42.2); zygomatic breadth, 64-66.6 (65.7); breadth across 

 mastoids, 44.8-45.7 (45.5); least interorbital breadth, 23.3-27.2 



(25.5) ; breadth of rostrum, 21.6-25 (23); maxillary tooth row, 

 22.2-24.4 (22.9). 



Remarks, — This race widely differs in color from its nearest rela- 

 tives, okanagana and oxytona, being even whiter than caligata. The 

 characters are strikingly shown by young specimens which are 

 almost pure white except on the hinder back and tail. Additional 

 material is needed to determine the exact range of the form and the 

 cranial characters of the males. 



Specimens examined. — Total number, 14, as follows: 



Idaho: Bitterroot Mountains (headwaters of Clearwater River), 3; Elk Summit, 



Salmon River Mountains, 2. 

 Montana: Upper St. Marys Lake (mountains near), 9. 



MARMOTA CALIGATA CASCADENSIS Howell. 

 Cascade Hoary Marmot. 

 (PI. X, fig. 1; PI. XV, fig. 4.) 

 Marmota caligata cascadensis Howell, Proc. Biol. Soc. Washington, XXVII, 1914, p. 17. 



Type locality. — Mount Rainier, Wash, (altitude, 6,000 feet). 



Distribution. — Cascade Range (at and above timberline) from 

 Mount Rainier, Wash., north to southern British Columbia. 



Characters. — Size large (equaling olympus and oxytona; larger than 

 caligata) ; color similar to that of caligata, but head and feet usually 

 browner and underparts darker; skull similar to that of oxytona 

 but relatively broader, much larger than that of either caligata or 

 okanagana. 



I Four specimens from type locality. 



