. The birds of eastern North America known to occur east of the nineteenth meridian ... Birds. 40 KEY TO THE KIRDS OF EASTERN NORTH AMERICA. Section 4. Length, over 21; bill, under 2; underparts, not white. Outer webs of primaries, dark l)rowu: bill, over (immature). Lams niyjcntatns smithsonianus. American Herring Gull. See No. 30. Outer webs of jiriinarii's. Ijrownish; bill, uuiler l.'.tO (^immature). Lams knmlieni. Kumlien's Gull. See No. 26. Outer webs of primaries, ash color (immature). iMms h'ucoptems. Iceland Gull. See No. 25. Section 5. Length, under 21. A baud of black ou the bil
. The birds of eastern North America known to occur east of the nineteenth meridian ... Birds. 40 KEY TO THE KIRDS OF EASTERN NORTH AMERICA. Section 4. Length, over 21; bill, under 2; underparts, not white. Outer webs of primaries, dark l)rowu: bill, over (immature). Lams niyjcntatns smithsonianus. American Herring Gull. See No. 30. Outer webs of jiriinarii's. Ijrownish; bill, uuiler l.'.tO (^immature). Lams knmlieni. Kumlien's Gull. See No. 26. Outer webs of primaries, ash color (immature). iMms h'ucoptems. Iceland Gull. See No. 25. Section 5. Length, under 21. A baud of black ou the bill (adult). IViU, dull yellow, tipped witli black (immature"). Lams cMaimrcnsis. Ring^billed Gull. See No. Terns Gulls. * Group 5. Wing, over 17 inches long. I'riinarit's. marked with more or less black. Lams marhnts. Great Black=backed Gull. See No. 27. No blaek ou ])rimarie Lams f/Janrus. Glaucous Gull. See No. 24. * For directions for mcasurcmoiit, sec paj^u Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Cory, Charles B. (Charles Barney), 1857-1921; Field Museum of Natural History. Chicago, Special edition printed for the Field Columbian museum
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Keywords: ., bookauthorcory, bookcentury1800, bookdecade1890, booksubjectbirds
