2 LAMELLIROSTRAL SWIMMERS — ANSERES. 



edly convex posteriorly (as in the nortlievn forms) ; the hiniella) being tlius completely hidden. 

 In Querquedula, on the other hand, the terminal portion of the tomium is strongly convex, and the 

 posterior half cut away, as it were, so as to fully expose the lamellaj. Through the forms occurring 

 in the southern hemisphere,^ this genus leads directly to Fwcilonetta, which in turn is intermediate 

 between Nettion and Dafila. 



The two species of Nettion occurring in the northern hemisphere are much alike, the males being 

 very handsome in plumage ; they may be distinguished as follows : — 



Com. Char, yldidt males: Head and upper half of the neck chestnut-rufous, marked with a 

 large patch of metallic green on each side the head, behind the eye ; chin and upper part of throat 



N. crecca. 



dull l)lack ; nuchal tuft blue-black ; lower part of the neck, upper part of the back, scapulars, and 

 lateral parts of the body beneath, beautifully undulated with black and white ; outer scapulars 

 marked Avith black and white ; speculum bright metallic gi'een, the lower feathers black, tipped 

 with white ; crissum black centrally, creamy buff laterally. Adult females : Wing, only, as in the 

 males ; elsewhere varied with dusky and brownish white, the former prevailing above, the latter 

 beneath ; the abdomen nearly or quite immaculate. 



1. N. carolinensis. A broad white bar across side of breast, Ijefore the wing ; inner webs of 



outer scapulars vermiculated with dusky and lirownish Avbite, the outer webs marked with 

 a longitudinal lanceolate spot of black, bordered internally with a white line. Hub. 

 North America generally. 



2. N. crecca. No white bar on side of breast ; inner web of outer scapulars wholly, and 



outer web partly, white ; exposed surface of outer webs almost entirely black ; undula- 

 tions of sides, etc., much coarser than in N. carolinensis. Hah. Palaearctic Region, occa- 

 sional in Eastern North America. 



Nettion carolinensis. 



THE AMERICAN GREEN-WINGED TEAL. 



Anas crecca, var. Forst. Philos. Trans. LXII. 1772, 383, 419. 



Anas [Boscluts) crecca, var. Sw. & Rich. F. B. A. II. 1831, 443. — Nutt. Man. II. 1834, 400. 



Anas crecca, "Linn." Wils. Am. Orn. VIII. 1814, 101, pi. 60, fig. 1 (not of Linn.). — Aud. Orn. 



Biog. III. 1835, 218 ; V. 1839, 616, pi. 228. 

 Anas carolinensis, Gmel. S. N. I. ii. 1788, 533. — Aun. Synop. 1839, 281 ; B. Am. VI. 1843, 281, 



pi. 392. 



' Among those may be mentioned, as very close to true Nettion, but approaching Pa:cilonct.ta in the 

 form of the bill and the greater elongation and acumination of the scapulars, toitials, and rectriees, Aiws 

 flavirostris, Vikiij,., of South America, and " Querquedula'' Eatoni, SnAivric, of Kerguelen Island. 



