490 



LAMELLIROSTRAL SWIMMERS — ANSERES. 



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 hreeding season : Wings as in the above ; else- 

 where, variegated with dusky and ochraceous, the former on the centres of the feathers, 

 and predominating on thf ujiper parts, the latter on the borders, and prevailing beneath. 

 Win---, 10.25-12.00 inches ; culnien, 2.00-2.40 ; tarsus, 1.50-1.80 ; middle toe, 1.90-2.15. 

 Ilah. Whole northern hemisphere. 



A. boschas, 



I. 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 liuff, everywhere streaked with dusky ; no black at Ijase 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 featliers 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; tar.^ns, 1.70-1.80 ; middle toe, 1.90-2.00. Hah. Florida. 

 B. Size small (wing, 8.50). 



4. A. Aberti i 9  Prevailing color ochraceous, spotted above and streaked beneath with 



1 Anas Aberti, Eidgway. 



1 Anas obscura, Lawr. Mem. Boston Soc. II. pt. iii. no. ii. 1874, 314 (Tepic, W. Mexico). 

 Alias Aberti, Kidgw. Proc. U. S. Nat. Mas. Vol. I. 1878, 250 (Mazatlan). 



Sp. Char. Adidt female : Size of Qiterqucdula discors and cyanoptera, hut in coloration closely resem- 

 bling A . fulvigula. Prevailing color ochraceous-buff, but this everywhere relieved by brownish-black spots 

 or streaks. Head, neck, and Iowlm' parts streaked, the streaks finest on the neck and sides of the head, 

 broadest on the juguhun und crissnni, which is .soniLnvhat tinged with rusty, and assuming the form of 

 oblong spots on the abdomen, thighs, and anal reginn ; tln-oat immaculate. Back, scapulars, and rump 

 with the blackisli pvudonnnatiiig ; the feathers bordered with ochraceous ; those of the back and the scap- 

 ulars witli irregular indentations and occa.sional 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 tijiped with pure white (forming a conspicuous band about .35 of an inch 

 wide), this i)receded by a velvety black bar of about ecpial width, the basal half or more (of the exi^osed 



