. The birds of eastern North America known to occur east of the nineteenth meridian ... Birds. rOlHCII'IDE. Gl.'KHKS. 25 WATER BIRDS. KEY TO THE SPECIES. FAMILY PODICIPID^ Grebes. Toes, four; three in front, one behind, with lobate webs. * Group 1. Wing, less than inches long. Depth of bill at base of culmen, over .40. In summer: Bill, with black baud; throat, black. In winter: Bill, without black band; throat, white. Fodilymhnspodiceps. Picd'billed Grebe. Hell Diver. See No. 4. Depth of bill at base of culmen, less than .40. In stcmmer: Two small tufts of brownish gray or buft
. The birds of eastern North America known to occur east of the nineteenth meridian ... Birds. rOlHCII'IDE. Gl.'KHKS. 25 WATER BIRDS. KEY TO THE SPECIES. FAMILY PODICIPID^ Grebes. Toes, four; three in front, one behind, with lobate webs. * Group 1. Wing, less than inches long. Depth of bill at base of culmen, over .40. In summer: Bill, with black baud; throat, black. In winter: Bill, without black band; throat, white. Fodilymhnspodiceps. Picd'billed Grebe. Hell Diver. See No. 4. Depth of bill at base of culmen, less than .40. In stcmmer: Two small tufts of brownish gray or buft-coloied feathers behind the eye; crown, nape, and throat, black. In vnnter: Plain colored, without black or buff on head; upper pluiriao;e, ffi-ayish black; uuderparts, silvery white, often tinged with ash gray on throat and sides. Cohjmhits nxritus Horned Grebe. See No. 2. * Group 2. Wing, over inches long. In siamner: Crown, black; upper throat, gray^ lower throat and breast, chestnut rufous; rest of uuderparts, silvery grayish white. In winter: No rufous brown on throat or breast. Colymhus hnlhwUi. HolboelPs Grebe. SeeXo. 1. * For directions for measurement, see pajje 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
