APPENDIX 
485 
2'. Under parts not reddish or spotted. 
3. Upper parts bluish gray. 
4. Tail very short. Nuthatches ; see Sitta, p. 453. 
, 4'. Tail not very short . . Gnatcatchers ; see Polioptila, p. 465. 
3'. Upper parts gray or brown. 
4. Throat black. Chickadees ; see Parus, p. 455. 
4'. Throat not black. 
5. Head crested. Titmice ; see Parus, p. 455. 
5'. Head not crested. 
6. Tail very short. 
7. Plumage slate gray. Water Ouzel, p. 432. 
7'. Plumage dark brown. 
Western Winter Wren, p. 449. 
6'. Tail not very short. 
7. Wings and tail strikingly marked with white. 
Mockingbird, p. 435. 
7'. Wings and tail not strikingly marked with white. 
8. Plumage dark slate gray .... Catbird, p. 437. 
8'. Plumage not dark slate gray. 
9. Plumage deep brown; wings and tail barred with 
black. 
10. Head with white superciliary. 
Bewick Wrens ; see Thryomanes, p. 446. 
10'. Head without white superciliary. 
House Wrens ; see Troglodytes, p. 448. 
9'. Plumage dull smoky gray or brown; wings and tail 
not barred . Bush-Tits ; see Psaltriparus, p. 460. 
