. The birds of eastern North America : known to occur east of the ninetieth meridian. Birds -- North America. FAMILY GULLS AND TERNS. 41. 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.
. The birds of eastern North America : known to occur east of the ninetieth meridian. Birds -- North America. FAMILY GULLS AND TERNS. 41. 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. 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
