. Les oiseaux de l'eau d'Amérique du Nord [microforme]. Les oiseaux ; les oiseaux d'eau ; Oiseaux ; oiseaux aquatiques. 424 L'DIVr.G OISEAUX - PYGOPODES. avec ceux des plus petits spécimens d'occidentalis. En fait, des exemples qui peuvent parfois se produire avec la même justesse être rel'errcil à l'autre des espèces ; la majorité, cependant, sont généralement l'un ou l'autre, le dillerentiated incomplètement les individus formant une petite minorité. Il n'appar-. '-J prudemment pas de différence de coloration entre les deux, mais c^here'u'semble d'avoir le plus souvent lores blanchâtre distinctement qu'occidentalis. (Voir Henshaw, " Bull

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. The water birds of North America [microform]. Birds; Water-birds; Oiseaux; Oiseaux aquatiques. 424 THE DIVr.G BIRDS — PYGOPODES. with those of the smaller specimens of occidentalis. In fact, examples occasionally occur which may with equal propriety be rel'errcil to either species ; a majority, however, are typically one or the other, the incompletely dillerentiated individuals forming a small minority. There is appar-. '-J ently no constant difference of coloration between the two, but C^ici'u'seems to have the lores more often distinctly whitish than occidentalis. (See Henshaw, " Bull. Nutt. Orn. Club, " Vol. VI. Oct. 18S1, pp. 214-218.) It is not unlikely that the present bird may yet prove to be simply the female of .E. occidentalis. This form, wliich bears a very strong rosemblaiioo to ^E. nreidentafis, was regarded by Mr. Lawreiuni as being a distinct s|»e(!ies, but is now considert I as only u varii'ty. While it thus strongly resembles the orrhlentalln in size and in some of its markings, it constantly ditt'ers. The two seem to have nearly the same habitat; aiul as it is not usual for two races of the same species to dwell in exactly the same area, it seems more probable either that the differences are specific, or that they possess sonu- sexual or other signitieanee, unless the present form should be found to have a more southern range. The first kiu)wn specimen of this form was taken by IVFr. J. 11. Clark in Chihiuihua, Jlexico, and other specimens were procured from the sea-coast of California at Santa Barbara and on San I'utddo liay. Dr. Cooper writes that near San Pedro, Cal., in July, 1803, he saw two large Grebes, which he had no doubt were of this variety, frequenting the creeks and bays for some months; but they were so very shy, a* d seemed to know so well the range of his gun, that he did not succeed in shooting one. He also saw large Grebtss at Mon- terey, after the 25th of September; and as that is much earlier than the jE. orr!(fen

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• bookcentury1800
• bookdecade1880
• booksubjectbirds
• bookyear1884