. Handbook of birds of the western United States including the great plains, great basin, Pacific slope, and lower Rio Grande valley . Measurement of Tarsus. TOPOGRAPHY OF A BIRD BIRDS OF THE WESTERN UNITED STATES KEY TO BIRDS. 1. Feet fully webbed (except grebes in Pyg-opodes, which have the toeslobed or margined).2. Foot with three webs, all four toes connected. Steganopodes : Totipalmate Swimmers, p. Foot with two webs, three front toes Nostrils tubular. Tubiiiares: Tube-nosed S^vimmers, p. Nostrils not tubular. 4. Edges of mandibles toothed or serrate. A
. Handbook of birds of the western United States including the great plains, great basin, Pacific slope, and lower Rio Grande valley . Measurement of Tarsus. TOPOGRAPHY OF A BIRD BIRDS OF THE WESTERN UNITED STATES KEY TO BIRDS. 1. Feet fully webbed (except grebes in Pyg-opodes, which have the toeslobed or margined).2. Foot with three webs, all four toes connected. Steganopodes : Totipalmate Swimmers, p. Foot with two webs, three front toes Nostrils tubular. Tubiiiares: Tube-nosed S^vimmers, p. Nostrils not tubular. 4. Edges of mandibles toothed or serrate. Anseres : Lamellirostral Swimmers, p. Edges of mandibles not toothed or Legs placed far back; wings short. Pygopodes : Diving Birds, p. Legs placed near middle of body; wings long and pointed. Longipennes : Long-Tvinged Swimmers, p. Feet incompletely or not at all Lores and ring around eye naked. Herodiones : Herons, Storks, and Ibises, p. Lores and ring around eye feathered. 3. Hind toe long and approximately on a level with front toes (except in cranes, which are over three feet long) . . PaludicolaB : Crane
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