INTRODUCTION. 
DEIsTDRAGAPUS, 
WITH THE FOLLOWING CHAKACTERS, 
Bill strong, upper mandible curved at tip ; large air-sacs on each side of ike necJc, capable of inflation, but usually hidden by the feathers ; 
wings rounded, third and fourth cpiills longest. Teal long, composed of twenty broad feathers. Tarsi feathered to the toes. 
Tho birds included in this genus are inhabitants of the western portion of North America. They are of large size^ the 
flesh white, and much esteemed as food. They are. 
7. DENDRAGAPUS OBSCURUS, Plate VII. 
8. “ RICHARDSONII, Plate VIII. 
For the fourth group, also consisting of only two species, I retain Reichenbach's genus 
CANA C E, 
WITH THE FOLLOWING CHARACTERS. 
Head without crest, neck destitute of air-sacs ; tail long, of sixteen feathers. 
These birds are uatires of North America, dwelling in the thick parts of the forests; go in flocks; are generally of a tame, 
unsusjiicious nature ; their flesh dark and bitter. They are, 
9. CANACE CANADENSIS, - Plate IX. 
10. '•' PRANKLINII, Plate X. 
Mr. Boardman informs me that this species allows one to approach very closely to it when in the woods, without mani- 
festing any alarm; and the only indication it gives of its intended flight, is by raising the membrane over the eye to its 
utmost extent, when the bird almost immediately takes rving, flying only, however, to a short distance. 
For the next species, an inhabitant of Northern Asia, and remarkable for the peculiar formation of its primary quills, I 
propose the term 
FALGIPENNIS, 
WITH THE FOLLOWING CHARACTERS. 
Head crested j wings short; the first four primaries greatly falcate; third and fourth longest. Tail moderate, of sixteen feathers. 
Tarsi thickly feathered. 
The only one known is, 
11. FALCIPENNIS HARTLAUBII, Plate XL 
For the sixth genus, composed also of a single species, I retain Swainson’s name, 
