230 AVES: ANSERES. —- XXXV. 
351. ANAS Linneus. (Lat., duck.) 
a. Culmen longer than middle toe without claw. 
b. Speculum violet, bordered with black ; bill greenish-yellow ; L. more 
than 20. 
688. A. boschas L. Mariarp Duck. Tame Ducg. ¢ 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.) (@ockds, 
mallard.) 
689. A. obscura Gmelin. Buack 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. 
351b. QUERQUEDULA Stephens. 
vc. Wing-coverts in both sexes sky-blue, the greater white tipped; scapu- 
lars in 4 striped with blue and buff; bill rather broad; head not 
crested; speculum green. 
690. Q. discors (L.). BLuE-wincep Treat. @ 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., 
W. to Rocky Mts., abundant. (Lat., discordant.) 
691. Q. cyanoptera (Vieillot). Crnwamon TEau. ¢ chiefly 
chestnut; top of head blackish; ? dulland streaky. L.17. W. 74. 
8. W., straying E. to Ill. (xvavos, blue; wrepdv, wing.) 
351c. NETTION Kaup. 
cc. Wing coverts leaden gray, without blue; bill very narrow. 
692. N.carolinense (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. 73. T. 33. N. Am., common; one of the best of the 
ducks as food. : 
351d. CHAULELASMUS Bonaparte. 
aa. Culmen shorter than middle toe without claw. 
d. Lamelle numerous, fine, more than 30 visible from outside. 
693. C.streperus (L.). GapwaLL. Gray Duck. ¢ barred, 
black and white, middle wing coverts chestnut, greater coverts 
black, speculum white; 9 dusky and tawny with little chestnut, 
