126 APPENDIX. 



Mr. DWIGHT describes the present form in The Auk for 

 July, 1887. 



Dendroica aestiva morcomi. 



WESTERN YEIXOW WARBLER. 



A new sub-species, separated from typical estiva, and des- 

 cribed by Mr. H. K. Co ALE, in Bulletin of the Ridgway Orni- 

 thological Club, No. 2, April, 1887. 



The author characterizes it as "similar to dendroica cestiva. 

 Colours lighter. Bill more slender." He considers the race as 

 " so different that it can readily be distinguished from the eastern 

 at sight." The type was taken at Fort Bridger, Utah. 



This sub-species probably occurs in Canada, from Manitoba 

 westward. 



