Subfamily I. CORVINE. 



1. Tbypanocohax, p. 8. 



Heterocorax, p. 11. 



Key to the Genera. 



Wings long, Mliug short of the tip of the 

 tail by very little, the difference never being 

 more than the length of the tarsus. 

 a'. Nostrils concealed with bristles. 



a". First primary long, equal to or ex- 

 ceeding the innermost secondaries in 

 length. 

 a"'. Face bare, as well as the nostrils ; 



forehead also devoid of plumes 

 h'". Face feathered, the nostrils hidden 

 by bristles. 

 a*. Nasal bristles short, the part of the 

 bill uncovered by them being 

 longer than the space between 

 the eye and the tips of the nasal 

 plumes ; biU thin and straight, 

 gently ciu^ed towards the tip . . 

 ¥. Nasal bristles long, the space be- 

 tween the eye and the tips of the 

 nasal plumes less than the remain- 

 ing portion of the bill, 

 rt', Tai'sus equal to or less than the 

 culmen, the latter equal to or 

 longer than the head. 

 «'. Nostrils placed in a more or less 

 defined groove ; the bill stout, 

 but not equalling in its depth 

 the length of the outer toe . . 3. Corvus, p. V6. 

 ¥. Nostrils placed in a very deep 

 groove ; depth of bill enor- 

 mous, gi-eater than length of 



outer toe 4. CoRVULTtJB, p. 24. 



6'. Tarsus longer than culmen, the 

 latter more or less shorter than 



the head 5. Colceus, p. 25. 



h". First piimary longer than the ordinary , 



secondaries, but not as long as the in- 

 nermost of the latter, 

 c'". Nasal bristles directed horizontally 



over the nostrils 6. Corone, p. 30, 



d". Nasal bristles erect and directed for- 

 wards and upwards 7. Rhinocorax, p. 45. 



e". First primary shorter, not equal to the 

 secondaries in length. 

 e". Nasal bristles very long, the distance 

 between their tips and the tip of the 

 upper mandible about equal to the 

 distance between the eye and the tips 

 of the nasal bristles. 

 c*. Bill curved, the angle of the cul- 

 men about equal to that of the 

 gonys towards the tip. 



