490 
LAMELLIROSTRAL SWIMMERS — ANSERES. 
1. A. boschas. Adult male in winter: Four middle tail-feathers strongly recurved or curled ; 
head and neck brilliant velvety green ; jugulum 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 male in breeding season : Wings as in the above; else- 
where, 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. 
Wing, 10.25-12.00 inches ; culmen, 2.00-2.40 ; tarsus, 1.50-1.80 ; middle toe, 1.90-2.15. 
Hob. Whole northern hemisphere. 
A. boschas. 
b. Sexes alike, at all ages and seasons ; no white on the outer surface of the wing. 
2. A. obscura. Prevailing color dusky, the feathers bordered with dull ochraceous ; head 
and neck dull buff, everywhere streaked with dusky ; no black at base of the bill ; 
speculum usually deep violet. Wing, 10.50-11.50 inches ; culmen, 2.00-2.35 ; tarsus, 
1.70-1.80 ; middle toe, 1.90-2.10. Hab. Eastern North America. 
3. A. fulvigula. Prevailing color ochraceous, the feathers marked centrally with dusky ; 
entire chin and throat immaculate creamy ochraceous or buff ; base of the maxilla, espe- 
cially below, black ; speculum usually green. Wing, 10.00-10.50 inches ; culmen, 2.05- 
2.35 ; tarsus, 1.70-1.80 ; middle toe, 1.90-2.00. Ilab. Florida. 
B. Size small (wing, 8.50). 
4. A. Aberti 1 9 • Prevailing color ochraceous, spotted above and streaked beneath with 
1 Anas Aberti, Ridgway. 
? Anas obscura, Lawr. Mem. Boston Soc. II. pt. iii. no. ii. 1874, 314 (Tepic, W. Mexico). 
Anas Aberti, Ridgw. Proc. U. S. Nat. Mus. Vol. I. 1878, 250 (Mazatlan). 
Sp. Char. Adult female : Size of Querqucdula discors and cyanoptera, but in coloration closely resem- 
bling A . fulvigula. Prevailing color ochraceous-buff, but this everywhere relieved by brownish-black spots 
or streaks. Head, neck, and lower parts streaked, the streaks finest on the neck and sides of the head, 
broadest on the jugulum and erissum, which is somewhat tinged with rusty, and assuming the form of 
oblong spots on the abdomen, thighs, and anal region ; throat immaculate. Back, scapulars, and rump 
with the blackish predominating ; the feathers bordered with ochraceous ; those of the back and the scap- 
ulars with irregular indentations and occasional bars of the same. Lesser wing-coverts brownish slate, 
bordered with dull earthy brown ; middle coverts with their exposed portion velvety black, forming a 
distinct bar. Secondaries widely tipped with pure white (forming a conspicuous band about .35 of an inch 
wide), this preceded by a velvety black bar of about equal width, the basal half or more (of the exposed 
