470 University of California Publications in Zoology (Vou. 17 
Specimens of Aplodontia rufa pacifica from Mercer, Lane County, 
Oregon, tend to be uniformly larger than others from the coastal 
region. One of them (no. 1600, Univ. Ore. Mus.) gives the maximum 
measurement in a series of more than twenty skulls in basilar length, 
length of nasals, zygomatic width, alveolar length superior cheek teeth, 
distance between infraorbital foramina, distance transversely across 
angular process of mandible, and greatest length of mandible. 
All specimens of aplodontia collected on or very close to the coast 
line (exeept the examples from Mercer just mentioned, and a skull 
only, from Port Orford, Oregon, no. 206368, U. S. Nat. Mus., Biol. 
Surv. Coll., which has broader nasals) are typical of the Newport 
form; but as specimens from points farther away from the coast are 
examined an increase in size is apparent, and the characters and color- 
ation tend in the direction of rufa. To this category belong specimens 
from Lane County, referred to pacifica (as no. 204887, U. S. Nat. 
Mus., Biol. Surv. Coll.), examples from Siskiyou, Oregon, referred to 
rufa (see p. 460), and a specimen from Briggs Creek, Oregon, thirteen 
miles southwest of Galice (no. 205239, U. 8S. Nat. Mus., Biol. Surv. 
Coll.), referred to pacifica. Examples from these localities partake 
of the characteristics of two subspecies often in nearly the same degree, 
and some or all of them might be referred to one with almost as much 
propriety as to the other. 
Intergradation with rufa is demonstrated by specimens of pacifica 
from Spencer Butte, seven miles south of Eugene, Oregon, and by 
examples of rufa from Siskiyou, Oregon. It seems probable that inter- 
eradation between the two forms takes place over a broad area north 
and south through central Oregon. 
Aplodontia rufa humboldtiana Taylor 
Humboldt Aplodontia 
Aplodontia rufus (part), Price (1894), p. 328. 
Haplodontia phaea (part), Elliot (1903), pp. 184, 185. 
Aplodontia phaea (part), Stephens (1906), p. 95. 
Aplodontia humboldtiana Taylor (1916a), pp. 21-23. 
Type—Male adult; no. 21162, Mus. Vert. Zool.; Carlotta, Hum- 
boldt County, California; January 4, 1914; collected by H. E. Wilder ; 
orig. no. 1494; stuffed skin, with skull and jaws, all in good condition. 
Specimens Examined.—A total of 24, from the following localities : 
California: Del Norte County—Requa, 1. Humboldt County—Sam Lane’s 
Ranch, 12 miles north of Hoopa, 3 miles southwest of Weitzpek, 3; Eureka, 5; 
Carlotta, 8; Cuddeback, 7. 
