1915.1 



NETiROTKICHUS GIBBSII GIBBSH. 



95 



Neurotrichus (sic) gr{66sw Giinther, Proc. Zool. Soc, London, 1880, pi. 42, October, 1880. 

 Neurotrichus gibbsii True, Proc. U. S. Nat. Miis., vol. 7, p. 607, 1885. 

 Neurotrichus gibbsii Bryant, Zoe, vol. 1, p. 359, February, 1891. 

 Neurotrichus gibbsi Merriam, Mazama, vol. 1, p. 228, 1897. 



Neurotrichus gibbsi mmjor Meniam, N. Am. Fauna No. 16, p. 88, October 28, 1899. 



T^Tpe locality, Carberry Pvanch, altitude 4100 feet, between Mount Shasta and 



Mount Lassen, Shasta County, California. 

 Neurotrichus gibbsii gibbsii Miller, U. S. Nat. Mus., Bui. 79, p. 11, December 31, 1912. 

 Neurotrichus gibbsii major Miller, IT. S. Nat. Mus., Bui. 79, p. 11, December 31, 1912. 



Type locality. — Wliite River Pass, north of Mount Eainier, Pierce 

 County, Washington. 



Type specimen. — No. -r^ij} U. S. Nat. Mus.; immature, sex un- 

 known; poorly made skin and fragmentary skull; collected July 15, 

 1854, by George Gibbs. 



GeograpMc range. — Extreme southwestern British Columbia, west- 

 ern Washington and Oregon west of the Cascade Mountains, south in 

 the coast region to Eureka, Humboldt County, Cal., and in the inte- 

 rior, west of the Sierra Nevada, to South Yolla Bolly Mountain, Cal. 



General cJiaracters. — Size small (total length averaging less than 

 120 mm.); color dark, usually dark mouse gray; tail medium in size 

 (about one-third of total length), scaled in transverse annular rows, 

 covered with a few blackish, coarse hairs; skull small (greatest 

 length usually less than 23 mm.), flat, and not angular. 



Color. — General tone dark mouse gray to blackish mouse gray, 

 occasionally dusky neutral gray; upperparts and underparts essen- 

 tially the same color, the underparts rarely shghtly paler than the 

 back; the longer hairs in full pelage frequently tipped with whitish, 

 producing a frosted appearance; recently killed animals and speci- 

 mens Httle handled generally show pm-phsh and greenish iridescence. 

 The worn pelage is paler and more brownish than the fresh. 



STcuU. — Sma,ll (greatest length usually less than 23 mm.), smooth, 

 flat, not much depressed postorbitally, not much constricted inter- 

 orbitally; frontal sinuses slightly swollen; zygomata short, weak; 

 pterygoids short, weak, laterally flattened; audital bullae incomplete; 

 rostrum moderate in length and width; dentition moderate; first 

 upper incisors flat and rodentlike; upper canine (third lateral tooth) 

 flattened laterally, much like first upper premolar; anterior portion 

 of cingulimi of second upper premolar not usually developed into a 

 superior cusplike process. 



Measurements. — ^Average of 9 adult males from Sum as, British 

 Colimibia: Total length, 113 (107-117); tail vertebrge, 37.1 (34-39); 

 hind foot, 16.6 (15.7-17). Average of 5 adult females from Sumas, 

 British Columbia: 116.6 (111-120); 36.4 (33-40); 17 (17-17). Av- 

 erage of 3 males from Carberry Ranch (type locahty of N. g. major), 

 Shasta County, Cal.: 119.7 (118-121); 40.3 (39-42); 17 (17-17). 

 SJcull: Average of 10 skulls of adult males from Sumas, British Co- 

 lumbia: Greatest length, 22.5 (22.1-23) : palatilar length, 9.4 (9.1-9.6) ; 



