. Birds of the Colorado valley ... scientific and popular information concerning North American ornithology;. Birds. DISTRIBUTION OP YELLOW-RUMPED WARBLER 283 Latham, and Pennant differs from the Yellow-rump of anthors; and have accounted for the large numher of polynomial Latin, French, and English names that the same bird has received. The state of the case is nothing unusual; for though the number of names is perhaps in excess, yet this is offset by the possibility of determining them all. The reader may imagine how inextricable would have been the confusion had the bird been some plainly-m
. Birds of the Colorado valley ... scientific and popular information concerning North American ornithology;. Birds. DISTRIBUTION OP YELLOW-RUMPED WARBLER 283 Latham, and Pennant differs from the Yellow-rump of anthors; and have accounted for the large numher of polynomial Latin, French, and English names that the same bird has received. The state of the case is nothing unusual; for though the number of names is perhaps in excess, yet this is offset by the possibility of determining them all. The reader may imagine how inextricable would have been the confusion had the bird been some plainly-marked species closely resembling several others. WHAT little I have here to say of the Myrtle-bird relates chiefly to its extensive dispersioa in the West beyond the recognized limits of the Eastern Province, of which the bird has been generally supposed characteristic. It is not remarkable that it should have been found iu some cases on the Pacific side, seeing that it extends northwestward obliquely across Brit- ish America into Alaska, where it breeds, and whence some individuals ^'o- warbier. pass south, reaching Washington Territory and doubtless yet other regions along the Pacific side. The westward trend of the species in the United States may correspond nearly with the oblique lay of the Coteau de Missouri in Dakota; thus the birds are common at the proper season in the Eed Eiver Valley, and thence in the same watershed nearly across Dakota, along the parallel of 49°,; but directly west of this, in the Mis souri watershed, and even in that of the Saskatchewan, they are not known to occur; and in the Eocky Mountains at 49°, 2). auduhoni is the species, not D. coronata. The common and regular occurrence of the Yellow-rump in the main chain of the Eocky Mountains is a fact of compara- tively recent recognition, fully attested by such observers as Trippe, Aiken, and Henshaw. Thus, the first named of these ornithologists speaks in the "Birds of the N
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