. A manual of North American birds [microform]. Birds; Ornithology; Oiseaux; Ornithologie. S62 NORTH AMERICAN BIRDS. (), depth of bill at nostrils (), tarsus (). Hab. Commander Islands, Kamtsehatka. (Probably also westernmost Aleutians.) C. corax behringianus Dybowski. Bering's Raven.' v. Feathers of neck, all round, pure white at base ; nasal tufts covering much more than basal half of upper mandible; exposed culmen less than , wing less than Length , wing (), tail (), exposed culmen (), depth o
. A manual of North American birds [microform]. Birds; Ornithology; Oiseaux; Ornithologie. S62 NORTH AMERICAN BIRDS. (), depth of bill at nostrils (), tarsus (). Hab. Commander Islands, Kamtsehatka. (Probably also westernmost Aleutians.) C. corax behringianus Dybowski. Bering's Raven.' v. Feathers of neck, all round, pure white at base ; nasal tufts covering much more than basal half of upper mandible; exposed culmen less than , wing less than Length , wing (), tail (), exposed culmen (), depth of bill at base . (.87), tarsus (). Eggs X 1-21, with markings averaging finer and more longitudinal than in other species. Hah. Southwestern United States and table-lands of Mexico; north to Indian Territory, Kansas, Colorado, and southern California, south to Guanajuato and Puebla 487. C. cryptoleucus Couch. White-necked Raven. a}. Feathers of throat short, blended. {Crows.) (Nest usually in trees.) b^. Nostrils completely hidden by the fully-developed nasal tufts; corner of mouth feathered. d. Tarsus , or more; lower parts glossed with violet (on margins of feathers) like upper parts; wing averaging more than , tail averaging more than d\ Largoi', with relatively larger and thicker bill. e'. Wing and tail averaging longer, but bill and feet decidedly smaller; length , wing (), tail (), exposed culmen (), depth of bill at base . (.76), tarsus (). Eggs X Ilab. Eastern North America, except southern Florida and arctic districts. 488. C. americanus Aud. American Crow. c'. Wing and tail averaging shorter, but bill and feet decidedly larger; length about , wing (), tail (), culmen (), depth of bill at base . (.80), tarsus (). Hab. Southern Florida. 488(1. C. americanus floridanus
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