Merriam — Six New (Iron ml Squirrels. 13' 



opposite side of Snake River, bul with shorter tail. Color gray, nol 

 dappled except in the young. Teeth very large, equaling maximum oi' 

 idahoensis I upper molariform series 8.5 mm. ). 



Cranio I characters. — Skull of medium size { larger than mollis ami canus; 

 slightly smaller than idahoensis), strongly buill bul slightly less massive 

 than idahoensis; zygomata not spreading and not bowed outward; teeth 

 large, broad and rounded — the toothrow equaling the largest idahoensis 

 i longer than mollis ami therefore much longer than canus I. 



The skull and teeth agree most closely with idahoensis from Payette, 

 Idaho, hut the skull is smaller and the zygomata are less spreading. 



Measurements. — Type specimen (not fully adult): Total length, 233; 

 tail. 47; hind foot. :;.;. 



Citellus canus vigilis subsp. nov. 



Typi from Vale, eastern Oregon. No. 168,361, female adult, T'. s. Nat. 

 Museum, Biol. Survey Coll. Collected April 29, 1910, by S. G. Jewett. 

 Original No. 30. 



Characters. — Similar in general to canus; color iron-gray, finely lined, 

 much as i n canus, hut more hoary-whitish. Skull large and massive, much 

 larger and heavier than canus — in fact decidedly larger than mollis and not. 

 materially smaller than idahoensis; zygomata broad and outbowed, much 

 as in idahoensis; bullae large, as in mollis — decidedly larger than in canux; 

 rostrum and nasals longer than in canus; toothrow (7.25-7.75) decidedly 

 longer than in conns hut shorter than in mollis and idahoensis. 



Comp&red with idahoensis from the opposite (eastern) side of Snake 

 River, vigilis is easily distinguished externally by the absence of dappling 

 on the back and by shorter and paler tail; and cranially, by smaller 

 bullae and shorter toothrow. 



Measurements. — Average of S adults from type locality < Vale, Oregon): 

 Total length, 207; tail vertebrae, 36; hind foot, 30.5. (Type specimen: 

 208, :;:;. 32.) 



Remarks. — Specimens from Paradise Valley, northeastern Nevada, 

 appear to he the same as those from Vale and Huntington, Oregon. 



Citellus mollis artemesiae subsp. nov. 



Type from Birch Creek, Idaho. No. UUr, male adult, U.S. Nat. 

 Museum, Biol. Survey Coll. Collected August '.», L890, by Vernon Bailey. 

 ( Original No. 1573. 



Range. — Sagebrush plains of southeastern Idaho (north of the range of 

 mollis; east of the range of idahoensis). 



Characters. — Smallest of the known forms of the mollis group. Similar 

 in general to mollis, hut tail grayer, with less bully fulvous; hullae and 

 teeth much smaller. 



Cranial characters. — Skull small, smaller and shorter than in mollis; 

 rostrum rather short and slender; zygomata moderately bowed; bullae 

 small — as small as in canus; molariform teeth decidedly smaller than 

 in mollis ( slightly larger than in canus). Compared with typical mollis, 

 the rostrum is shorter, the zygomata more bowed, the bullae much 



