. 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. Illustrated by 6 steel plates and upwards of 250 woodcuts. Birds. Booted" tarBua, of a robin. Fig. 10. Sctitellate tavsiis, of a cat-bii'd. Fig. 11. 6. tarsus, of a pigeon; a. reticulate tarsus, of a plover. § 81. When an unfeathered tarsus shows on its front surface no divisions of the podotheca, or only two or three divisions close by the toes, it is said to be booted, and the podotheca is
. 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. Illustrated by 6 steel plates and upwards of 250 woodcuts. Birds. Booted" tarBua, of a robin. Fig. 10. Sctitellate tavsiis, of a cat-bii'd. Fig. 11. 6. tarsus, of a pigeon; a. reticulate tarsus, of a plover. § 81. When an unfeathered tarsus shows on its front surface no divisions of the podotheca, or only two or three divisions close by the toes, it is said to be booted, and the podotheca is said to be fused. (Fig. 9.) This con- dition chiefly occurs in higher Oscines, and is siijoposed by many, particu- larly German ornithologists, to indicate the highest type of structure; but it is also found in some water birds, as Wilson's stormy petrel. It is not a very common modification. Among North American birds it only occurs in the following cases:âGenera Turdus (1), Oinclus (5), Saxicola (6), Sialia (7), Regidus (9), OhamcBa9 (11), Myiadestes (52) and Oceanites (307)7if and even these birds, luhen young, show scutella, which disappear with age, by progressive fusion of the acrotarsial podotheca. § 82. The Crus, when bare below, may present scutellation either before ⢠or behind, or both, as is seen in many waders where the crus is largely naked; often again, the crural podotheca may consist of loose, sottish, â movable skin, not obviously subdivided: sometimes it is truly reticulate, as in the genus Heteroscelus (221). § 83. The Tarsus, in general, may be called subcylindrical; it is often quite circular in transverse section; very rarely thicker across than fore-and- aft (as in penguins) ; but very often thicker in the reverse direction. When this transverse thinness becomes noticeable, the tarsus is said to be. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and app
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbirds, bookyear1872
