120 
KEY TO FAMILIES 
Order IV v Steganopodes. — Gannets, Cormorants, Pelicans, etc. 
Large birds, two feet or more in length, differing widely in appearance 
and habits; in external structure agreeing in having all four toes con- 
nected by webs (Fig. 29), though in the Fregatidce and Phaethontidce 
this character is poorly developed. 
A. Bill unhooked, more or less sharply pointed (Figs. 27, 28, 30). 
a. Chin feathered, adult with very long central tail-feathers; 
maritime; general appearance ternlike; rarely enters United 
States. . . Family Phaethontidce: Tropic Birds (Fig. 28), p. 178. 
b. Chin bare; central tail-feathers not greatly lengthened. 
b 1 . Sea-birds with thick necks and stout bills, central tail- 
feathers without transverse flu tings. . . . Family Sulidce: 
Gannets (Fig. 27), p. 179. 
6 2 . In whole or part black or blackish; fresh- water or coast 
birds, with straight, slender bills (Fig. 30), central tail- 
feathers fluted. . . . Family Anhingidce: Darters, p. 181. 
B. Bill hooked (Figs. 31, 32). 
а. Lores bare, tail not forked. 
a 1 . Bill over 12-00, with a large pouch. . . . Family Pelicanidce: 
Pelicans, p. 183. 
a 2 . Bill under 4'00 (Fig. 31), no large pouch; black or blackish 
birds. . . . Family Phalacrocoracidce: Cormorants, p. 182. 
б. Lores feathered; tail deeply forked (Fig. 32). . . . Family 
Fregatidce: Man-o’-war-birds, p. 185. 
