ANAT11LE— THE SWANS, GEESE, AND DUCKS. 127 



Subgenus ANAS Linn.eus. 



Anas Linn. S. N. cd. 10, i, 1758, 122: ed. 12, i, 17C0, 194. Type, by elimination, A. bos- 

 chas Linn. 



Subgkn. Char. Usually rather large-sized ducks (wing, in North American species, 

 10 inches or more), with the bill a little longer than the head or foot, rather broad, de- 

 pressed, the edges parallel, the end rounded; speculum metallic green, blue, or violot, 

 in both sexes, usually bordered posteriorly by a black band, this generally succeeded 

 by a white one. 



The two species which are known- to occur in Illinois are 

 characterized as follows: 



A. Adult male, except in breeding season, very different from the female, the plumage 

 varied and brilliant; secondaries tipped with white, and greater coverts crossed by a 

 subterminal bar of the same. 



1. A. boschas. Adult rhale: Four middle tail-feathers strongly recurved; head and 

 neck brilliant velvety green; chest rich chestnut, with a white collar between it 

 and the green of the neck; speculum rich metallic violet, bounded anteriorly by a 

 black bar, this preceded by a white one, and posteriorly by a black subterminal 

 and white terminal band. Adult female and main in breeding season: Wings 

 as in the above; elsewhere variegated with dusky and ochraceous, the former 

 on the centres of the feathers, and predominating on the upper parts, the latter 

 on the borders, and prevailing beneath. 



B. Sexes alike, at all ages and seasons; no white on the outer surface of the wing. 



2. A. obscura. Prevailing color dusky, iho feathers bordered with dull ochraceous ; 

 head and neck dull buff, everywhere streaked with dusky; no black at b 



the bill; speculum usually deep yiolet. 



Anas boschas Linn. 



MALLARD. 



Popular synonyms. Green-head; Wild Drake; Wild Duck; English Duck (Florida'; 



h Duck (Louisiana); Gray Duck; Gray Mallard. 

 Anas boschas LlNN. S. N. ed, 10, i, 17.",s, 1.7; ed. 12, i. 1766. 205.- Wins. Am. Orn. viii. 

 1814, 112, pi. 70. f. 7.-Aur>. Orn. Biog. iii. 18:;:., Pit, pi. 221; Synop. 1839, 276; B. 

 Am. vi. 1843, 236, pi. 885.— Baird, B. N. Am. 1 it. X. Am. B. 1859, No. 576.— 



Coues, Key, L872, : List, 1873, 188; B. N. W. 1874, 559. B. B, & R, Water 



];. N. Am. i. 1884, 491.— Hbnsh. Zool. Wheeler's Exp. 1875, 172.— A. 0. U. Cheok 

 I t. 1886. No. 132.— BlDGW. Orn. 40th Par. Is;;, 621; Man. N. Am. B. 1887, 91. 

 Anasboscas Whabton, l ; 153.— Bidgw. Nom. N. Am, B. 1881, No. 601. Q< 



Check List, 2d od. 1882, No. 707. 

 domestica Gmel. 8. N. i, pt. Li, 1788, 



sw. & Rich. f. B.-A. Ii, 1831, Man. ii. is;i. :;;s. 



:. Mus. 1811 

 Anas ed. 12, I, 1766, 206.— Gmhi.. S. N. i. pt ii. 1788 



ii u . d hemisphere; In North America, generally distributed, migrating 



south in winter to Panama, Cuba, and 



Sr. CHAB. f| liril- 



lianl metallic green, showing purple and golden-bpron In different lights. 



A ring ol pure white round the lowi tpted behind; oh 



