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Dades bibliogràfiques
Autor principal:	Sclater, P. L.
Format:	Recurso digital
Idioma:
Publicat:	Zenodo 1878
Matèries:	Biodiversity Taxonomy Animalia Chordata Aves Passeriformes Motacillidae Anthus Anthus furcatus
Accés en línia:	https://doi.org/10.5281/zenodo.18470627
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5. ANTHUS FURCATUS.Anthus furcatus, Lafr. et D’Orb. Syn. Av. p. 27; D’Orb. Voy. Ois. p. 227; Darwin, Zool. Beagle, iii. p. 85 (La Plata).Anthus brevirostris, Tacz. P. Z. S. 1874,p. 507 (Peru).I have compared one of Mr. Taczanowski’s specimens of his Anthus brevirostris with the type of A. furcatus at Paris, and believe I may say that they belong to the same species. Whether, however, it will be ultimately possible to keep this form distinct from A. correndera I am not quite so certain. One of Mr. Hudson’s skins from Conchitas in my collection and two others in the Smithsonian series, all marked " Cachila ” by Mr. Hudson, and not distinguished by him from A. correndera, certainly cannot be separated from A. furcatus.The characters of this species (if, as I say, it is to be kept distinct) are the smaller bill, short and more curved hind claw, less spotted under surface, and different markings of the second outer rectrix. There are slight variations in all these points, which render i t difficult, to say the least of it, to decide in every case to which of the two specips a particular specimen is to be referred, though when two such extremes are compared as Taczanowski’s A. calcaratus and A. brevirostris it is somewhat startling to affirm that they ought to be put together. For the present, at any rate, I keep them distinct.In A. furcatus, then, the outer rectrix is pure white, with a broad black patch on the inner web, beginning at the base, and extending up to within one third of the length of the feather from the tip. Towards the tip there is likewise more or less indication of a narrow black patch on the outer web. In the second rectrix (see fig. 2 a) there is a very clear and distinct broad white line along the inner side of the shaft, the remaining (outer portion) of the inner web being quite black. This is obviously a mere augmentation of the corresponding colours in A. correndera; but the colours are much more definite.D’Orbigny gives Patagonia and High Bolivia as the patria of his Anthus furcatus. If my views as to his species are correct, it also occurs near Buenos Ayres and in Central Peru, having nearly the same range as A. correndera. The question is, Is it really separable from that species?I n three examples of A. f w c a t u s before me the two middle rectrices are slightly shorter than the others, and the tail may be said t o be slightly forked. But I also observe this feature in some specimens of A. corredera.

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