CORVUS. 361 



locality), ^ggs 2-7, pale bluish green, pale olive, or olive, spotted or dashed (or 

 both) with olive-brow a (sometimes nearly uniform olive, from density of 

 markings). 



a\ Feathers of throat lanceolate, distinct from one another. (Ravens.') (Nest usually 



among rocks.) 



b^. Feathers of neck dull gray at base ; nasal tufts covering not more than 



basal half of upjier mandible ; exposed culmen 2.40, or more, wing more 



than 15.00. 



c'^ Third quill equal to or longer than fifth. 



d}. Bill relatively shorter and higher, lanceolate feathers of throat 



less developed, more purplish in color, and plumage usually 



less lustrous; wing 16.75-18.00 (17.25), tail 9.40-10.00 (9.60), 



exposed culmen 2.65-3.00 (2.81), depth of bill through nostril 



1.05-1.12 (1.08), tarsus 2.78-2.95 (2.86). Hah. Europe and parts 



of Asia. C. corax Linn. Raven.i 



cP. Bill relatively longer and shallower, lanceolate feathei-s of throat 



larger, more violet or bluish, and plumage usually more 



lustrous. 



e^. With smaller or slenderer bill, the tarsus more slender, with 



• ■ 

 less of upper portion concealed by feathering of lower 



part of thighs; length about 21.50-26.00, wing 15.10-18.00 

 (16.87), tail 9.00-11.00.(9.86), exposed culmen 2.40-3.05 

 (2.80), depth of bill through nostril .82-1.05 ''(.94), tarsus 

 2.60-3.00 (2.78). Eggs 1.98 X 1-29. Hab. Western United 

 States, and south to Guatemala. 



486. C. corax sinuatus (Wagl.). Mexican Raven. 

 e^ With larger or stouter bill, tarsus shorter and stouter, with 

 more of upper portion concealed by feathering of lower 

 part of thighs ; length about 22.00-26.50, wing 16.50-18.00 

 (16.99), tail 9.20-10.50 (9.86), exposed culmen 2.65-3.45 

 (3.03), depth of bill at nostrils .95-1.12 (1.04), tarsus 2.50- 

 2.80 (2.65). Eggs 2.02 X 1-38. Hab. Northern North 

 America, from Greenland to Alaska, south to British Co- 

 lumbia, Canada, New Brunswick, etc." 



— . C. corax principalis Eidgw. Northern Raven.' 

 c^. Third quill decidedly shorter than fifth. 



Otherwise like G. corax principalis, but still larger; wing 16.75- 

 18.10 (17.44), tail 10.00-10.85 (10.49), exposed culmen 3.00-3.40 



1 Corvus cornx LiNN., S. N. ed. 10, i. 1758, 105. 



2 From lack of specimens, I am unable to determine which form Ravens from the eastern United States 

 belong to. 



* New subspecies, for which there is unfortunately no older name available. Corvns camivorus Bartr. and C. 

 higuhria Agass. are purely nomina nuda ; C. corax var. litioralis HoLB. (1843) is preoccupied (C. ??7#o/'a^/s Brehm, 

 1831) ; while C. vociferna Cabot, quoted by CouES and others as a synonyme of C. corax, is in reality Psilorhinus 

 mexicanxia Ritpp., and is described from Yucatan. 



46 



