Appendix, 



resident of the valleys, breeding in the moun- 

 tains; never very common. In general a more 

 yellowish gray tone of coloration than in other 

 species. 



157. Least Vireo; Vireo bellii pusillus (Coues). 

 Size small. Head dull gray; back olive-gray; 



rump indistinct olive-greenish; breast silky 

 white; ring around eye indistinct ; wing bars 

 narrow. Southern and interior valley regions 

 of the State. A plain grayish little bird inhabit- 

 ing willows and thickets. 



158. Gray Vireo; Vireo vicinior Couts. 



Very similar to the preceding, but wing bars 

 indistinct or wanting. Very rare in the interior 

 of southern California. 



THE WOOD WARBLER FAMILY. 



One of the most interesting and attractive groups 

 of North American birds. Inhabitants of wood- 

 land and grove; insect eaters; rather small, active 

 birds, constantly gleaning the leaves for food. 

 The prevaiHng colors are black, yellow, and 

 olive-green, although gray, chestnut and other 

 colors occur in some species. There is great 

 variation with age, sex, and season, the females 

 being generally dull and difficult to distinguish. 

 The bill and feet are deHcately formed. The 

 length is generally between four and five inches. 



159. Caleveras Warbler; Helminthophila rubri- 

 capilla gutturalis (Ridgw.). 



This is the western race of the Nashville warbler, 

 being more brilliantly colored than the eastern 



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