. The warblers of New England . sentative of the genus to which it belongs. AMERICAN WAUBLERS. 61 Origin of the Genera and Distribution. While a few species ofof the Wood Warblels ( Detidroica ) are still to be found scattered through thesub-tropical region of America as residents, audit is highly probable that they alloriginated there or further south, the greater number now return to their ances-tral homes as winter visitors, migrating further north in summer to breed. Ex-ceptions to the rule that all the individuals of all the species migrate south inwinter, may be found in the Yellow-rump,
. The warblers of New England . sentative of the genus to which it belongs. AMERICAN WAUBLERS. 61 Origin of the Genera and Distribution. While a few species ofof the Wood Warblels ( Detidroica ) are still to be found scattered through thesub-tropical region of America as residents, audit is highly probable that they alloriginated there or further south, the greater number now return to their ances-tral homes as winter visitors, migrating further north in summer to breed. Ex-ceptions to the rule that all the individuals of all the species migrate south inwinter, may be found in the Yellow-rump, in which species, although a largenumber migrate as far south as Florida, and some even to the West Indies, manyremain further north: some spending the winter in Massachusetts. Another ex-ception, but in another way, may be found in the Pine Warbler. In this species alarge number migrate northward in summer, but there are also a large numberof individuals that are constantly resident in the Carolinas and southAvard to Fig. A, tongue of Yellow Warbler ; B, same of Chestnnt-sided, both enlarged. C, section ofstomach of Chestimt-slded ; D, entire stomach of same ; H, section of stomach of YellowWarbler; c, lining membi-aiie; W, walls; P, proventriculiis ; D, duodenum; I, pancreas: II, in-testine. E, inner side of bronchial tube of Yellow Warbler, enlarged ; F, outer side of syrinxof same; T, tympaniform membrane; v, bronchial tube; w, windpipe; II, inner bronchialismuscle ; O, ouier of same ; Ti, sterno-tracheal muscle. Florida. While, beyond doubt, the Yellow-rumps are showing an inclinution toabandon the habit of migration, this is not so certain in regard to the Pines ; itmay be possible that they have, comparatively speaking, recently began to acquirethe habit of migration. But without pausing at present to further consider theseinteresting problems, we may state that, as a genus, the species of Wood Warb-lets are inclined to be migrants, and in migrating to push northwa
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