12 PROCEEDINGS OF THE ACADEMY OF [Jan., 



Vireo huttoni huttoni. Hutton Vireo. 



Hut ton vireos were found frequenting that part of the Transition 

 zone in which oaks are most numerous, but were also often seen 

 feeding in spruces. They remained throughout the winter in uniform 

 numbers. 



There seems to be absohitely no difference between the six Siski- 

 you skins and a series from the Santa Cruz Mountains and vicinity 

 of Monterey, the latter being the type locality of huttoni. Monterey is 

 in the southern extremity of the humid coast Transition, and there 

 has always seemed a doubt as to the existence of a race obscurus in the 

 northern part of the same belt. S. N. Rhoads, in the Auk, Vol. X, 

 July, 1S93, p. 238, clearly pointed out the untenability of obscurus, but 

 no one seemed to pay any attention to his remarks. As to the exist- 

 ence of a really distinct form on Vancouver Island (F. h. insularis 

 Rhoads), we have as j^et no specimens to indicate it. Looking at 

 Anthony's description of obscurus, we find that he used southern 

 California birds in comparison with his Oregon ones. Some skins 

 now at hand from Pasadena, in moderately worn spring plumage, 

 are not so green dorsally and laterally as birds of the same season 

 from the Santa Cruz district. This is evidently due to the greater 

 rate of fading and abrasion in the arid southern climate, for the 

 majority of specimens in fresh fall plumage are indistinguishable, and 

 equivalent extremes are to be picked out of both series. Sixty speci- 

 mens have been examined in this connection. 



Dendroica auduboni. Audubon Warbler. 



A male was shot from a small flock on the west side of White-Cloud 

 ridge on September 12. After that none were seen. 



Cinclus mexicanus. American Dipper. 



Fairly common from the Klamath up Horse and Seiad creeks to an 

 altitude of 5,000 feet. Five skins were preserved. 



Troglodytes hiemalis pacificus. Western Winter Wren. 



This proved to be a common bird of the Siskiyou region, where it was 

 almost always to be found in the blackberry tangles along the smaller 

 streams. Seventeen skins secured serve only to emphasize the geo- 

 graphical uniformity of this race in its long north-and-south range. 



CertMa americana zelotes. Sierra Creeper. 



Creepers are comparatively numerous in the region of Horse creek. 

 They were often seen busily searching about the bases of the Douglas 

 spruce or hurriedly climbing spirally up the trunk of some pine or 

 oak. The eleven specimens procured do not seem to differ in the 



