. Birds of the Colorado Valley : a repository of scientific and popular information concerning North American ornithology . ing 10 primaries, of which the first is very short orspurious, and booted tarsi. Itis essentially an Old Worldgroup, represented in the west-ern hemisphere only by thecharacteristic American genusSialia, with three species, andby a single species of the typi-cal genus ISaxicola, some of theFig. 14.—Details of structur<.oi^,;i;i;oza. dctalls of the external form ofwhich are illustrated in fig. 14. This species, the well-knownStone Chat or Wheatear of Europe, S. cenanthe
. Birds of the Colorado Valley : a repository of scientific and popular information concerning North American ornithology . ing 10 primaries, of which the first is very short orspurious, and booted tarsi. Itis essentially an Old Worldgroup, represented in the west-ern hemisphere only by thecharacteristic American genusSialia, with three species, andby a single species of the typi-cal genus ISaxicola, some of theFig. 14.—Details of structur<.oi^,;i;i;oza. dctalls of the external form ofwhich are illustrated in fig. 14. This species, the well-knownStone Chat or Wheatear of Europe, S. cenanthe, occurs sparinglyin Greenland, along the North Atlantic coast of America, andalso in Alaska; it is generally considered as simply a stragglerfrom the Old World, but it is apparently not rare in Labrador,in which country there is reason to believe it breeds. Genus SIALIA Swainson Chars.—Primaries 10, the 1st spurious and very pointed, the tip formed by the 2d, 3d, and 4th much shorter than the wings, emarginate. Bill about halfas long as the head or less, straight, stout, wider than deep at. SAXICOLIDiE SIALIA SIALIS 77 the base, compressed beyond the nostrils, notched near the tip,the culmeii at first straight, then gently convex at the end, gonysslightly convex and ascending, commissure slightly curvedthroughout. Nostrils overhung and nearly concealed by theprojecting bristly feathers of the forehead. Lores aud chinlikewise bristly. Gape ample, the rictus cleft to below the eyes,furnished with a moderately developed set of bristles reachingabout opposite the nostrils. Feet short, though rather stout,adapted exclusively for perching (iu Saxicola, and other typicalgenera, the structure of the feet indicates terrestrial habits).Tarsi not longer than the middle toe. Lateral toes of unequallengths. Claws all strongly curved. Blue is the principal color of this beautiful genus, which con-tains three species, all of them occurring in the Colorado
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