2 LAMELLIROSTRAL SWIMMERS — AXSERES. 



edly convex posteriorly (as in the northern forms) ; the hiniellie Ijeing thus completely hidden. 

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

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

 in tlie southern hemisphere,^ this genus leads directly to Fmcilonetta, which in turn is intermediate 

 between Nettion and Dafila. 



The two species of Xdtion occurring in the northern hemisphere are much alike, the males lieiiig 

 very handsome in jduniage ; tliey may be distinguislied as hdlows : — 



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 ])art of throat 



N', crecca. 



dull black ; nuchal tuft blue-black ; lower part of the neck, uj^i^er part of the back, scapulars, and 

 lateral parts of the body l)eneatli, beautifully undulated with black and white ; outer scapulars 

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

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

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

 beneath ; the abdomen nearly or quite immaculate. 



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



outer scapulaivs vermiculated with dusky and brownish Avhite, the outer webs marked with 

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

 Xnrth America generally. 



2. N. crecca. No white bar on side of l)reast ; 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. Palaarctic Region, occa- 

 sional in Eastern North America. 



Nettion carolinensis. 



THE AMERICAN GREEN-WINGED TEAL. 



Anas crecca, var. Fokst. Philos. Trnns. LXII. 1772, 383, 419. 



Anus (Boschas) crecca, var. Sw. & I!icn. F. B. A. II. 1831, 443. — Nutt. Man. II. 1834, 400. 



Anas crecca, "LiNX." WiLs. Am. Oni. VIII. 1814, 101, pi. GO, fig. 1 (not of Linn.). — Auu. Oin. 



Biog. III. 1835, 218 ; V. 183!), 616, pi. 228. 

 Anas carolmeiisis, Gmel. S. N. 1. ii. 1788, 533. — Aud. Synop. 1839, 281 ; B. Am. VI. 1843, 281, 



pi. 392. 



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

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

 flavirostris, Vieili.., of South ATiiciicn, ami " Querquedula'' Eatoni, Shaiipk, of Kerguelen Island. 



