1916] Kellogg: Mammals and Birds of Northern California 365 



the slate black bases of the hairs forming a distinct dark back- 

 ground. Nose and region around mouth dark seal brown; throat 

 patches, when present, and inside of pouches, white. 



Coloration of specimens from Gazelle, Siskiyou County, in sum- 

 mer pelage is as follows: Middle of back fulvous brown, brighten- 

 ing into fulvous on the sides; face slightly darker than back. Un- 

 derparts tawny oehraceous, except the throat and sides of head, 

 which are bright fulvous ; patches at sides of mouth seal brown ; 

 throat patch and inside of pouches white. 



Thomomys monticola pinetorum Merriam 



Trinity Pocket Gopher 



This name seems to be applicable to a slightly marked sub- 

 species ranging west from Mount Shasta through the higher parts 

 of the Trinity region. As far as coloration goes I cannot say that 

 there is much difference between Thomomys monticola monticola 

 and T. m. pinetorum, although the latter may be considered a trifle 

 brighter; but in skull characters, series of the two are for the most 

 part distinguishable. The best skull character of monticola is the 

 shape of the interparietal, which is about twice as broad as it is 

 long; in pinetorum the interparietal is only slightly broader than 

 its length. One point emphasized in the original description of 

 pinetorum (Merriam, 1899, p. 97) is that the zygomata are much 

 more widely spreading than in monticola. Our specimens do not 

 seem to bear this out; but they do show much more distinct tem- 

 poral ridges, and this we may consider a diagnostic feature of the 

 subspecies. 



A series of 182 specimens was procured (nos. 13483-13664), 

 from the following localities: Scott River, Jackson Lake, Saloon 

 Creek divide, North Fork of Coffee Creek, Coffee Creek, South Fork 

 of Salmon River, head of Grizzly Creek, head of Rush Creek, head 

 of Bear Creek, Castle Peak. A series of fourteen males from Rush 

 Creek averages : total length, 210.5 millimeters ; tail vertebrae, 58.7 ; 

 hind foot, 28. 



The coloration of a specimen from Jackson Lake in worn winter 

 pelage may be described as dark fulvous above; the colored ends 

 of the hairs entirely worn off in places, leaving patches of slate 

 black; underparts light oehraceous; nose and mouth parts seal 



