Family 61. WAGTAILS. Motacillidæ.
Hind toe-nail much lengthened; bill slender, nostril not covered with bristles, as in true Larks; back of tarsus thin, not rounded; terrestrial, walking with a wagging motion of the tail.
Family 62. DIPPERS. Cinclidæ.
Thick-set birds with short wings and tail; plumage thick and water-proof; tarsus scaled; semi-aquatic in habit, haunting mountain streams.
Family 63. WRENS, THRASHERS, ETC. Troglodytidæ.
Tarsus scaled; tail rounded, the outer feathers being shortest; third to fourth primary longest, the outer half as long; bill in Thrashers often decurved, its base with bristles; In Wrens, bill without bristles; brown or grayish inhabitants of lower growth.