2 LAMELLIROSTRAL SWIMMERS — ANSERES. 



ed]y convex posteriorly (as in the northern forms) ; the lamellae being thus 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 lamella;. Through the forms occurring 

 in the southern hemisphere, 1 this genus leads directly to Pcecilonetta, which in turn is intermediate 

 between Nettion and DaJUa. 



The two species of Nettion occurring in the northern hemisphere are much alike, the males 1 icing 

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



Com. Char. Adult 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 



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

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

 marked with black and white ; speculum bright metallic green, the lower feathers black, tipped 

 with white; crissum black centrally, creamy huff 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 bread white bar across side of breast, before the wing ; inner webs of 



outer scapulars vermiculated with dusky and brownish white, the outer webs marked with 

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

 North America generally. 



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



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

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

 sional in Eastern North America. 



Nettion carolinensis. y 



THE AMERICAN GREEN-WINGED TEAL. 



Anas crecca, vat. Forst. Philos. Trans. LXII. 1772, 3S3, 410. 



Anas {Soschas) crecca, var. Sw. & Rich. F. B. A. II. 1S31, 443. — Xutt. Man. II. 1S34, 400. 



Anas crecca, "Linn." Wii.s. Am. Orn. VIII. 1S14, 101, pi. 60, fig. 1 (not of Linn.). — Aud. Orn. 



Biog. III. 1S35, 218 ; V. 1S30, 616, pi. 228. 

 Anas carolinensis, Gmel. S. N. I. ii. 1788, 533. — Aur>. Synop. 1830, 281 ; B. Am. VI. 1843, 2S1, 



pi. 302. 



1 Among these may he mentioned, as very close to true Nettion, hut approaching Pcecilonetta in the 

 form of the bill and the greater elongation and acumination of the scapulars, tertials, and rectrices, Anas 

 flavirostris, Vir.ii.i.., of South America, and "Querquedula" Eatoni, Sharpe, ofKerguelen Island. 



