14 PROCEEDINGS OF THE ACADEMY OF [Jan., 



variation in shade of back and pileum due to wear and fading, but the 

 fresh fall birds all look alike. 



Kegulus satrapa olivaceus- Western Golden-crowned Kinglet. 



This bird, when observed at all, was always in the flocks of chick- 

 adees and nuthatches. Seven specimens, all males, were secured 

 during the winter. 



HylocicMa guttata nana. Dwarf Hermit Thrush. 



On December 20 the only small thrush seen was shot from an alder 

 in Seiad Valley. This specimen, on account of its small size and brown 

 coloration, is easily referable to the northern humid coast form nana. 



Merula migratoria propinqua. Western Robin. 



Seen occasionally throughout the winter, almost always with the 

 varied thrushes. It ranges from the Klamath river up to the limit of 

 the black oak timber at least. 



Ixoreus nsevius naevius- Varied Thrush. 



The varied thrush, although seen throughout the winter, was not 

 common until January, when large flocks appeared on the meadows in 

 Seiad Valley. (This valley is almost free from snow). When the 

 snow left the meadow at Grater's during February, numbers of these 

 thrushes appeared there. At the same time they became common in 

 the oak forests. Sixteen specimens were preserved. These average 

 in characters close to the Sitkan form. 



Sialia mexicana occidentalis. Western Bluebird. 



A male bluebird was shot from a small flock on White-Cloud ridge, 

 September 12. After this none were seen until February 9, when a 

 bird appeared near camp. They soon after became common both in the 

 vicinity of Grater's and in Seiad Valley. 



Summary. 



The foregoing list is a remarkable one as showing the association of a 

 number of birds not usually found together. The Siskiyou Mountains 

 are evidently on the narrow line of mergence between the humid coast 

 fauna and the arid Sierran fauna. Representative species of the two 

 areas are here found in about equal numbers, in winter at least, as 

 shown by the following comparative table : 



