124 



NORTH AMERICAN FAUNA. 



[no. 39. 



6,400 feet), 63; Salmon Creek Divide (Siskiyou County), 4; Salmon River 

 (south fork, 5,000 feet), 5; Scott River (6 miles northwest of Callahans), 8; 

 Siskiyou Mountains (6,000-7,000 feet on White Mountain and Craggy Peak 

 and in Studhorse Canyon), 22; Taylor Fork of Salmon River (5,000 feet), 2; 

 Trinity Mountains (west end, 5,700 feet), 5. 

 Oregon: Anna Creek (Mount Mazama), 3; Ashland Peak, 2; Crater Lake (Mount 

 Mazama), 5; Diamond Lake, 7; Fort Klamath, 13; Grizzly Peak (near Ash- 

 land), 1; McKenzie Bridge, 19; Mount Hood (west slope, 6,000 feet), 5; 

 Mount Hood (Summit House at southern base), 5; Prospect, 1; Siskiyou 

 Mountains, 2; Sisters (north base), 3; Three Sisters (town), 17. 



THOMOMYS MONTICOLA PINETORUM Merriam. 



Yellow Pine Pocket Gopher. 



(PI. VIII, fig. 3.) 



Thomomys monticola pinetorum Merriam, N. Am. Fauna No. 16, 97, Oct. 28, 1899. 



Thomomys monticola premaxillaris Grinnell, Univ. of Cal., Pub. Zool., XII, 312, Nov. 

 21, 1914. Collected on South Yolla Bolly Mountain, at 7,500 feet altitude, by 

 G. Ferris, Aug. 6, 1913. Type specimen in Mus. Vert. Zool., Univ. of California. 



Type. — Collected at Sisson, west base of Mount Shasta, California, 

 by R. T. Fisher, September 4, 1898. Type specimen in U. S. Nat. 

 Mus., Biological Survey collection. 



Distribution. — Mountains along west side of Sacramento Valley, 

 Cal., from Sisson south to South Yolla Bolly Mountain (fig. 5). 



Characters. — Very similar to monticola, but upperparts brighter, 

 more golden brown; nose and cheeks conspicuously gray. 



Color. — Summer pelage: Upperparts yellow -hazel, such as is seen 

 in yellow-pine bark, but never in color keys; ear patch blackish; 

 nose and cheeks conspicuously plumbeous or grayish, often extend- 

 ing back to or beyond ears; underparts buffy; tail and feet gray or 

 whitish. Winter pelage: Slightly duller than in summer. Young, 

 paler than adults. 



Slcull. — Similar to that of monticola, but with nasals more con- 

 spicuously emarginate at posterior tips, and falling 1 to 2 mm. short 

 of tips of premaxillse; interparietal smaller and more rounded, and 

 lateral ridges more nearly parallel in adults. 



Measurements. — Type (c?ad.): Total length, 210; tail vertebrae, 

 76; hind foot, 28. Average of 5 topotypes (9 ad.): 200, 73, 27.6. 

 Slcull (of type, ad.): Basal length, 33; nasals, 13; zygomatic 

 breadth, 20; mastoid breadth, 18; interorbital breadth, 6; alveolar 

 length of upper molar series, 7. 



Remarks. — In series of specimens from South Yolla Bolly Moun- 

 tain ^ and from the head of Grindstone Creek, still farther south, the 



1 Thomomys monticola premaxillaris Grinnell differs from pinetorum in a slight accentuation of the same 

 characters that separate that form from monticola. The premaxillfe extend 2 mm. back of the nasals in 

 the type of pinetorum, 24 mm. in the type of premaxillaris, while in monticola they are approximately even 

 with it. The nasals in premaxillaris are decidedly narrower and more deeply emarginate than in monticola 

 but very slightly more so than in pinetorum. The types of premaxillaris and pinetorum are indistinguish- 

 able in coloration. To recognize premaxillaris would seem to me to be splitting one rather poor subspecies 

 in two. 



