LINNEAN SYSTEM.— BIRDS.) __ 147 
II. Picx. Bill compressed, convex. ' 
A. Feet formed for perching. 
Trochilus. Humming Bird. Bill bent down ; tongue tubul: r. 
Certhia. Creeper. Bill bent down, sharp pointed. 
Upupa. Hoopoe. Bill bent down, somewhat obtuse. 
Buphaga. Beef-eater. Bill straight, quadrangular. 
Sitta. Nuthatch. Bill straight, wedged at the top. 
Oriolus. Oriole. Bill straight, conic, very sharp pointed. 
Coracias. Roller. Bill sharp edged, the points bent down. 
Gracula. Grakle. Bill sharp edged, equal, naked at base. 
Corvus. Crow. Bill sharp edged; frontlet reversed. 
Paradisea. Paradise Bird. Bill somewhat sharp edged ; 
frontlet velvetty. 
B. Feet formed for climbing (Scansores, part) 
Ramphastos. Toucan. Bill serrate; tongue feathered. 
Trogon. Trogon. Bill serrate, hooked at the point. 
Psittacus. Parrot. Bill hooked; tongue fleshy. 
Crotophaga. dnoo. Bill wrinkled, angular at the edges. 
Galbula. Jacamar. Bill quadrangular, very sharp pointed. 
Picus. Woodpecker. Bill angular; tongue worm-shaped.. 
Yunx. Wryneck. Bill smooth ; tongue worm-shaped. 
Cuculus. Cuckow. Bill smooth ; nostrils margined. | 
Bucco. Barbut. Bill smooth, notched, hooked. 
C. Feet formed for walking. 
Buceros. Hornbill. Bill serrate; front bony. ~~ 
Alcedo. Kingfisher. Bill straight, triangular. 
Merops. Bee-eater. Bill bent down, a little compressed. 
Todos. Jody. Bill linear, depressed, straight. 
III. Anseres. Swimming Birds. (Natatores Illiger.) 
Anas. Duck. Bill toothed, with a nail at the tip; teeth 
membranaceous. 
Mergus. Merganser. Bill with a nail at the tip ; teeth subulate. 
Pheton. Tropic Bird. Bill sharp edged, compressed, serrate. 
Plotus. Diver. Bill toothed, subulate, serrate. 
Rhynchops. Skimmer. Bill with the upper mandible shorter, 
Diomedia. Albatross. Bill with the lower mandible truncate. 
Alca. dwk. Bill with transverse lateral grooves. 
Procellaria. Petril. Nostrils forming a long tube. 
Pelicanus. Pelican. Bill girded ; face naked ; chin pouched. 
Larus. Guill. Bill withthe lower mandibles gibbous. _ 
Sterna. Tern. Bill subulate, compressed at the point. 
Colymbus. Grebe. Bill subulate, the sides a little com- 
pressed. 
be 
