126 



NORTH AMEETCAN FAUNA. 



[no. 39. 



THOMOMYS MONTICOLA HELLERI Elliot. 

 Heller Pocket Gopher. 

 Thomomys helleri Elliot, Field Columb. Mus., zool. ser. Ill, 165, 1903. 



Tyjpe. — Collected at Goldbeach, mouth of Rogue River, Oregon, 

 by E. Heller, in 1901. No type designated. Type series in Field 

 Mus. Nat. Hist. 



Distribution. — Coast region of southwestern Oregon (fig. 5). 



Characters. — ^About the size of mazama, but with darker richer color- 

 ation and slenderer skull. 



Color. — October pelage: Upperparts dull chestnut or mars brown; 

 sides and underparts becoming ochraceous; ear patches intense black; 

 nose and face blackish, rarely a trace of white on lips; feet mottled or 

 whitish; tip of tail usually white. Young oi the year, duUer colored. 



SlcuU. — Similar to that of mazama but with narrower rostrum and 

 nasals, smaller bullse, and shorter pterygoids, with wider intervening 

 fossa. 



Measurements. — ^Average of 4 male topotypes: Total length, 203; 

 tail vertebrse, 55; hind foot, 29. Average of 4 female typotypes: 195, 

 57, 27.2. Sl{:ull (of topotype c? ad.):^ Basal length, 34; nasals, 14.3; 

 zygomatic breadth, 22; mastoid breadth, 18.6; alveolar length of 

 upper molar series, 7.5. 



Remarlcs.— These gophers are abundant on the flats on both sides 

 of the mouth of Rogue River but are not generally distributed on the 

 coast nor back in the timbered interior. They form a partially iso- 

 lated colony with their nearest relatives mazama on the open moun- 

 tain ridges of the Coast Ranges and Cascades. Their group relation- 

 ship is so clearly with mazama and monticola that it seems best to 

 place them as a subspecies of monticola. 



Specimens examined. — Total number, 19, as follows: 

 Oregon: Goldbeach, 11; Wedderbum (north side of river), 8. 



Thomomys fuscus Group. 



THOMOMYS FUSCUS FUSCUS Merriam. 

 Brown Pocket Gopher. 

 (PI. Vm, figs. 13, 14; text fig. 4.) 

 Thomomys clusius fuscus Merriam, N. Am. Fauna No. 5, 69, July, 30, 1891. 



Type. — Collected on mountains at head of Big Lost River, Idaho, 

 at about 8,000 feet altitude, by B. H. Dutcher, September 23, 1890. 

 Type specimen in U. S. Nat. Mus., Biological Survey collection. 



Distribution. — Southeastern British Columbia, greater part of 

 northern and central Idaho and western Montana, northwestern 

 Wyoming, and parts of eastern Washington and Oregon (fig. 5) . 



1 No. 166949, U. S. Nat. Mus. 



