. Review of American birds in the Museum of the Smithsonian Instution. [microform]. Birds; Oiseaux. VIUEONID^. 321 '''he three strictly dentlrostral families of Oscine birds which still remain for considerationâthe Vireonidae, Ampelidse, and Laniadeeâ differ from those just described in certain common characters. The 1)111 is usually stouter and more hooked, in some forms excessively so, with a deep notch and sometimes a prominent tooth behind it; the tip of the lower mandible is also more or less notched. The nostrils are lateral, the bristles of the mouth generally well de- veloped. Except i
. Review of American birds in the Museum of the Smithsonian Instution. [microform]. Birds; Oiseaux. VIUEONID^. 321 '''he three strictly dentlrostral families of Oscine birds which still remain for considerationâthe Vireonidae, Ampelidse, and Laniadeeâ differ from those just described in certain common characters. The 1)111 is usually stouter and more hooked, in some forms excessively so, with a deep notch and sometimes a prominent tooth behind it; the tip of the lower mandible is also more or less notched. The nostrils are lateral, the bristles of the mouth generally well de- veloped. Except in a few species of Vireo and in Ampelis, there are ten distinct primaries, the outer from one-fourth to one-half the second. The tail is sometimes short and square, sometimes long and graduated. The tarsus is always scutellate* anteriorly, and exhibits a tendency to subdivision in the lateral plates, very unusual ill the families already considered. The basal joints of the toes are also more adherent than in the preceding: sometimes attached throughout, sometimes more free, much as iu Troglodytidse. From the typical Turdidm they will bo known by the scutellate tarsi, from all of the family by the greater adhesion of toes, and peculiar bill; from the Troglodytidse by the notch and hook of bill and other characters. The only form resembling Sylvicolidae (^Hylophilux) has ten primaries and a more notched bill, as well as more united toes and very large claws. While in the characters referred to, the three families differ from those previously under review, their precise limitation among them- selves has been a subject of much difficulty. The proper position of Dulus, especially, has been a matter of considerable doubt, although it seems more properly placed among the Ampelidse, being removed from the Vireonidae on account of its less adherent toes, longer basal phalanges of anterior toes, wider gape, etc. In various respects, too, Ampelis can hardly be combined with Ptilogonys,
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbirds, bookyear1872
