. Handbook of birds of eastern North America : with keys to the species, and descriptions of their plumages, nests and eggs, their distribution and migrations ... . earl-gray, over 9*00. a. Outer tail-feather entirely pure white. ai. Bill over 1-75, tipped with yellowish ... 67. Cabots Bill under 1-75, without a yellow tip . 72. Roseate Tern (Im.). b. Outer tail-feather not pure white. b^. Inner web of outer tail-feather darker than outer web ; outer web 78 TERNS. II mostly or entirely white; a black space generally on the side of the head iziclosing the eye 09. Forsters Tern (Im.). J
. Handbook of birds of eastern North America : with keys to the species, and descriptions of their plumages, nests and eggs, their distribution and migrations ... . earl-gray, over 9*00. a. Outer tail-feather entirely pure white. ai. Bill over 1-75, tipped with yellowish ... 67. Cabots Bill under 1-75, without a yellow tip . 72. Roseate Tern (Im.). b. Outer tail-feather not pure white. b^. Inner web of outer tail-feather darker than outer web ; outer web 78 TERNS. II mostly or entirely white; a black space generally on the side of the head iziclosing the eye 09. Forsters Tern (Im.). J2. Outer web of outer tail-feather darker tlian inner web; tarsus over -70 70. Common Tern (Im.), Js. Outer web of outer tail-feather darker than inner web; tarsus under -70 71. Arctic Tern (Im.). B. Wing blackish, over 9-00. a. Under parts blackish 75. Sooty Tern (Im.). h. Under parts white 76. Bridled Tern (Im.). 4. Crown silvery gray ; lores black ; rest of plumage sooty black. 79. Wing over ISOO. A. Wing 15-00 or over; outer primary mostly gray. 64. Caspian Tern. B. Wing under 15-00; inner half of inner web of lirst primary white. 65. KoYAL Fig. 61.—First primaries of adult Terns, seen from below. Co) Caspian Tern ;(,6) Royal Tern ; (c) Common Tern ; [d) Arctic Tern ; (e) Roseate Tern. 63. Gelochelidon nilotica Hasselq. Gull-billed Tern; MarshTern. Ad. in, sum>/ier.—Top of the head and nape black; back and wingspale pearl-gray; outer web of outer primaries silvery; tip and shaft part ofthe inner web darker; inner part of the inner web, except for a narrow mar- TERNS. 79 gin at the end of the feather, white; tail wliite, slightly forked, the middlefeathers grayish; under parts white; bill and feet black, the former rathershort and stout. Ad. in winter.—Similar to the above, but top of the headwhite, auriculars grayish, and a space in front of the eye blackish. L., 14-50;W., 12-00; T., 5-50; B., 1-40; depth of B. at base, -50. Range.—Cosmopolitan; in
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
