. The birds of eastern North America : known to occur east of the ninetieth meridian. Birds -- North America. SUB=FAMILY STERNIN/E. Terns. Upper mandible, nearly straight, not hooked or decid= edly rounded near tip; outer tail feathers, usually longer than middle feathers; toes, four; front toes, webbed; hind toe, small, but well developed. * Group 1. Wing, to inches long. Forehead, white; bill, black; imderparts, white; back, pearl gray; crown, black (adult in summer); back and crown, mottled (immature). Sterna antillarum. Least Tern. See No. 48. * Group 2. Wing, to inches
. The birds of eastern North America : known to occur east of the ninetieth meridian. Birds -- North America. SUB=FAMILY STERNIN/E. Terns. Upper mandible, nearly straight, not hooked or decid= edly rounded near tip; outer tail feathers, usually longer than middle feathers; toes, four; front toes, webbed; hind toe, small, but well developed. * Group 1. Wing, to inches long. Forehead, white; bill, black; imderparts, white; back, pearl gray; crown, black (adult in summer); back and crown, mottled (immature). Sterna antillarum. Least Tern. See No. 48. * Group 2. Wing, to inches long. Head and imderparts, black (adult). A patch of black behind the eye; back of head, dusky; rest of head, white (immature). Hydrochelidon nigra surinamensis. Black Tern. See No. *" Group 3. Wing, to inches long. Outer tail feathers, pure white. Inner web of outer tail feather, gray. i. Roseate Tern. See No. 47. Sterna forsteri. Forster's Tern. See No. 44. * Group 4. Wing, to 11 inches long. Outer web of outer tail feather, darker than inner web; back, pearl gray; breast, washed with pearl gray; bill in adults, red, tipped with black; tarsus, usually over .70. Sterna himudo. Common Tern. Wilson's Tern. See No. 45. Inner web of outer tail feather, darker than outer web; back, pearl gray; breast, white; bill in adults, black, slightly yellowish at tip. Sterna forstcri. Forster's Tern. See No. 44. Outer tail feather, entirely pure white; back, pearl gray; breast, white, often tinged with faint rose color; bill, in adults, black with basal portion, red. Sterna dougalli. Roseate Tern. See No. 47. * For directions for measurement, see page 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. Chicago : Field Columbian Museum
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectbirdsnorthamerica
