230 AVES: ANSERES. XXXV. 



351. ANAS Linnseus. (Lat., duck.) 

 a. Culmen longer than middle toe without claw. 



b. Speculum violet, bordered with black ; bill greenish-yellow ; L. more 

 than 20. (Anas.) 



688. A. boschas L. MALLARD DUCK. TAME DUCK. $ head 

 and upper neck rich glossy green, a white ring below; breast 

 purplish chestnut ; speculum violet, with black and white before 

 and behind it; 9 duller, chiefly dull ochraceous, streaked with 

 dark brown. L. 24. W. 12. N. Am., abundant; commonest 

 westward. Original of the common domestic duck ; various hy- 

 brids of this species with others are described. (Eu.} (/3oo-/cdy, 

 mallard.) 



689. A. obscura Gmelin. BLACK DUCK. Size of mallard and 

 resembling the 9 but darker ; both sexes entirely dusky, varied 

 with brown ; no decided white except under the wings. E. U. S., 

 common W. to Iowa. 



bb. Speculum green; bill dusky; L. less than 20. 



c. Wing-coverts in both sexes sky-blue, the greater white tipped ; scapu- 

 lars in J striped with blue and buff; bill rather broad; head not 

 crested. ( Querquedula Stephens.) 



690. A. discors L. BLUE-WINGED TEAL. $ head and neck 

 blackish plumbeous, darkest on the crown; a white crescent in 

 front of eye; under parts thickly spotted ; 9 dull streaky brown- 

 ish and buffy, known by the wings. L. 16. W. 7. T. 3. E. U. S., 

 \V . to Rocky Mts., abundant. (Lat., discordant.) 



691. A. cyanoptera Vieillot. CINNAMON TEAL. $ chiefly 

 chestnut ; top of head blackish ; 9 dull and streaky. L. 1 7. W. 

 1\. S. W., straying E. to 111. (KVCLVOS, blue; irrepov, wing.) 



cc. Wing coverts leaden gray, without blue ; scapulars waved with black 

 and white; bill very narrow; head slightly crested. (Nettion 

 Kaup.) 



692. A. carolinensis Gmelin. GREEN-WINGED TEAL. Head 

 and upper neck rich chestnut in $ ; a green patch behind eye ; 

 upper parts with wavings of black and white ; white below ; buffy 

 on breast, with dark spots ; 9 different, known by the small size 

 and color of wing ; white crescent on sides in front of wings. 

 L. 15. W. 7. T. 3. N. Am., common ; one of the best of the 

 ducks as food. 



aa. Culmen shorter than middle toe without claw. 



d. Lamellae numerous, fine, more than 30 visible from outside; bill not 

 shorter than head. ( Chaulelasmus Bonaparte.) 



693. A. strepera L. GADWALL. GRAY DUCK, g barred, black 

 and white, middle wing coverts chestnut, greater coverts black, 

 speculum white ; 9 dusky and tawny with little chestnut, known 



