Appendix. 



' a'. Wings and tail brownish gray, un- 

 marked. Sides of head conspicuously 

 white. 



Mountain Chickadee i 89 



b\ Wings with two white bars; outer 

 tail-feathers white; sides streaked with 

 black. 



Black-throated Gray Warbler 



164 



b. Throat and breast white, but tail largely 

 black with white edgings. 

 a'. Tail short ; habits of woodpeckers ; 

 two middle tail-feathers bluish like 

 back. 



a'\ Sides of head broadly white, in- 

 cluding the eye. 



Slender-billed Nuthatch 185 



b", A black stripe back of eye with 

 a white line separating it from 

 black cap; belly more or less bufFy. 

 Immature Red-breasted Nut- 

 hatch . . . 186 



b'. Tail long; size very small. 



Black-tailed Gnatcatcher 197 

 2. Stripes of black and white or chestnut and 

 white on the head. 



a. Stripes of black, white and chestnut on 

 head and sides of throat; tail black and 

 white. 



Western Lark Finch . 121 



b. Stripes of black and white on top and 

 sides of head only. No white on tail. 



White-crowned Sparrow i 20 



252 



