362 NORTH AMERICAN BIRDS. 



(3.20), depth of bill at nostrils 1.05-1.10 (l.OS), tarsus 2.G0-2.85 

 (2.75). Hab. Commander Islands, KamtscbatUa. (Probably 

 also westernmost Aleutians.) 



C. corax behringianus Dybowski. Bering's Raven.' 



V. Feathers of neck, all r<nind, pure white at base ; nasal tufts covering much 



more than basal half of upper mandible ; exposed culmen less than 2.40, 



wing less than 15.00. 



Length 18.75-21.00, wing 13.10-14.25 (13.G7), tail 7.50-8.G0 (8.10), 



exposed culmen 2.00-2.35 (2.15), depth of bill at base .85-.90 (.87), 



tarsus 2.20-2.50 (2 35). Eggs 1.74 X I-IO, with markings averaging 



finer and more longitudinal than in other species. Hab. 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 Kaven. 



a'. Feathers of throat short, blended. {Crows.) (Nest usually in trees.) 



t*. Nostrils completely hidden bj- the fully-developed nasal tufts ; corner of 

 mouth feathered. 

 c'. Tarsus 2.15, or more ; lower parts glossed with violet (on margins of 

 feathers) like upper parts; wing averaging more than 11.75, tail 

 averaging more than 7.00. 

 d}. Larger, with relatively larger and thicker liill. 



e'. Wing and tail averaging longer, but bill and feet decidedly 

 smaller; length 17.00-21.00, wing 11.90-13.25 (12.36), tail 

 6.90-8.00 (7.43), exposed culmen 1.80-2.05 (1.92), depth of 

 bill at base .72-.82 (.76), tarsus 2.20-2.40 (2.27). Eggs 1.69 

 X 1.17. -ff«&- Eastern North America, cxcejit southern 

 Florida and arctic districts. 



488. C. americanus Aud. American Crow. 



e". "Wing and tail averaging shorter, but bill and feet decidedly 



larger; length about 20.00, wing 11.50-12.30 (12.15), tail 



7.00-7.70 (7.23), exposed culmen 2.00-2.20 (2.08). depth of 



bill at base .75-85 (.80), tarsus 2.40-2.50 (2.45). Hab. 



Southern Florida. 



488(7. C. americanus floridanus 1!aiui). Florida Crow. 



(P. Smaller, with relatively smaller and more slender bill. 



Length about 18.50-19.25, wing 11.10-12.75 (11.95), tail 6.45- 

 7.80 (7.10), exposed culmen 1.60-1.95 (1.78), depth of bill 

 at base .62-.70 (.68). tarsus 2.15-2.40 (2.23). Hah. Western 

 United States, north to AVashington Territory (Puget 

 Sound), Idaho, Montana, etc., south to northern Mexico, 

 east to Pocky Mountains. 



— . C. americanus hesperis Uidow. California Crow.' 



1 O.roi.. cornx bchrinjianu, DvnowsK. Bull. Soc. Z»ol. Franco, 18S.1, .363. 



» New subspecies ; a very strongly charactoriscd raoo which also dilTcra markedly in habits and notes from 

 the euetern bird. 



