. The birds of eastern North America known to occur east of the nineteenth meridian .. . dull black or brownish black, moreor less marked with white. Larus argentatus smithsonianus. American Herring QuII. See No. 30. * For directions for measurement, see page 9. FAMILY LAKID.E. GULLS AND TERNS. 39 Section 2. Length, over 21; bill, over 2; underparts, not white. Outer webs of primaries, ash color (immature). Lams glaucus. Glaucous Qull. See No. 24. Outer webs of primaries, dark brown; wing, over 17.50; depth of l)ill at angle, over .90(immature). Lams marinus. Great Black-backed Qull. See jSTo.
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. The birds of eastern North America known to occur east of the nineteenth meridian .. . dull black or brownish black, moreor less marked with white. Larus argentatus smithsonianus. American Herring QuII. See No. 30. * For directions for measurement, see page 9. FAMILY LAKID.E. GULLS AND TERNS. 39 Section 2. Length, over 21; bill, over 2; underparts, not white. Outer webs of primaries, ash color (immature). Lams glaucus. Glaucous Qull. See No. 24. Outer webs of primaries, dark brown; wing, over 17.50; depth of l)ill at angle, over .90(immature). Lams marinus. Great Black-backed Qull. See jSTo. 27. Outer webs of primaries, dark browu; depth of bill at angle, under .90; wing, under 17.50(immature). Lams argentatus smithsoniamis. American Herring Qull. See No. 30. Section 3. Length, over 21 ; bill, under 2; underparts, white. Back, grajisli ])ln<, more or less black on primaries. Lams arfjentntus smithsonUinns. American Herring Qull. See Xo. :(). Back, pale pearl color; pri-maries, whitish or pearl color, shading to white at tips. Lams leucnpfems.Iceland Qull.See No. 25.. Great Hlack backed Gull. Kinir liillcil (Mill. Back, pale jn-arl color: iiriniarif?marked with slaty gray. Liiriis kxmlieni. Kumiiens (iull.See No. 2(;. HiMThi;. (iull. 40 KEY TO THE BIRDS OF EASTERN NORTH AMERICA. Section 4. Length, over 21; bill, under 2; underparts, not white. Outer webs of priniaries, dark 1)rowii; bill, over 1.00 (immature). Laritx ar(irnt.(ttns siiiithsoninmis. American Herring Gull. See No. 30. Outer vel)s of primaries, brownish; bill, under l.HO (immature). Lams knmlieni. Kumliens Gull. See No. 26. Outer we1>s of i)rimaries, asli color (innnature). Larvs Irneopterns. Iceland Gull. See No. 25. Section 5. Length, under 21. A band of blaek on the bill (adult). 15111, didl yellow, tipped with black (immature). Lams delawarrnsis. Ring=billed Gull.See No. 31.