. Key to North American birds. Containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland and lower California, with which are incorporated General ornithology, an outline of the structure and classification of birds, and Field ornithology, a manual of collecting, preparing, and preserving birds . e frontal crescent Bill and feet black aleutica Mantle pearly. Wing under (Stehnuia.) A white frontal crescent. Bill and feet yellow, former black-tipped antillarum Mantle du
. Key to North American birds. Containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland and lower California, with which are incorporated General ornithology, an outline of the structure and classification of birds, and Field ornithology, a manual of collecting, preparing, and preserving birds . e frontal crescent Bill and feet black aleutica Mantle pearly. Wing under (Stehnuia.) A white frontal crescent. Bill and feet yellow, former black-tipped antillarum Mantle dusky. Wing over 8 00. A white frontal crescent. Bill and feet black. (Onychoprion.) Mantle blackish-brown ; cap the same fuliginosa Mantle sooty-gray ; cap black ancestheia Obs. — Above analysis based on adult svimmer birds, and not entirely available for young and winter ones, in whichthe characters of the cap, and colors of bill and feet, may be entirely different. These must be determined by referenceto the detailed descriptions. (Subgenus Thalasseus.) S. (T.) caspia. (Of the Caspian Sea. Fig. 690.) Caspian Tern. Imperial Tern. Ofinaxiinuin size. Length ; extent ; wing , usually ; tail only , forked about , middle feathers broad to their rounded ends, restgrowing successively more acute, but lateral pair ivithout any slender filamentous Fig. OJO. —Caspian Tern, | nat. size. (From Brehm.) Bill extremely large, along culmen, along gape, deep at base, wide atnostrils; culmen regularly curved from base to tip; outline of mandibular rami slightly con-cave ; gonys about straight; angle not very well marked. Tibiae bare about ; tarsus ,rather exceeding middle toe and claw, the scutella in front replaced by polygonal scales similar — STERNIN^—TERNS, SEA SWALLOWS. 1005 to but larger than those on its sides, which are rough; hind toe extremely small; outer lateralnearly as
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectbirdsnorthamerica
