. New England bird life: being a manual of New England ornithology; . OSEATE TERN. Sterna dougalli Mo7tt. Chars. Bill black, usually orange at base below ; mantle very palepearly-blue ; primaries with the white band broad and usuallyextending to the very tip. Below, pure white, or rosy-tinted;feet coral-red. Changes of plumage as in other species. Length, ; wing, ; tail, ; bill, ,very slender ; tarsus, This most elegant of all our Terns occurs in New Eng-land under the circumstancesalready fully detailed under headof 5. Jiiriindo. The princip
. New England bird life: being a manual of New England ornithology; . OSEATE TERN. Sterna dougalli Mo7tt. Chars. Bill black, usually orange at base below ; mantle very palepearly-blue ; primaries with the white band broad and usuallyextending to the very tip. Below, pure white, or rosy-tinted;feet coral-red. Changes of plumage as in other species. Length, ; wing, ; tail, ; bill, ,very slender ; tarsus, This most elegant of all our Terns occurs in New Eng-land under the circumstancesalready fully detailed under headof 5. Jiiriindo. The principalpoint to be noted is, that thisis a southerly bird, unknown inthe very high latitudes to whichWilsons and the Arctic Tern re-sort to breed. In fact, it chieflyoccurs with us south of CapeCod, which may be regarded asthe normal limit of its extension,though it is known to occur as c ,, , 1 .r- Til Fig. 70.—Roseate Tern. tar north as the Green Islands, in Casco Bay, Maine, where Mr. Brewster once observed a small flock in July (Bull. Nutt. Club, iv, 1879, p. 15).. LEAST superciliaris antillarum {Less.) Coues. Chars. Bill yellow, usually tipped with black ; mantle pale pearlygrayish-blue, extending unchanged on the rump and tail; a white 372 LARIDiE : JAEGERS, GULLS, TERNS, ETC. frontal crescent separating the black cap from the bill, boundedbelow by a black loral stripe reaching the bill ; shafts of two ormore outer primaries black on the upper surface, white under-neath ; feet orange. Young : cap too defective to show the cres-cent ; bill dark, much of the under mandible pale ; feet small. Length, only ; wing, ; tail, ; bill, ; tarsus, The distribution of the Least Tern is nearly coincidentwith that of the Roseate, being for the most part re-stricted by Cape Cod in northward extension. The usual number of eggs of this species is two, notthree, and often only one is laid. They do not averageover ,
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