128 



Subfamily VI. CHENONETTINiE. 



Key to the Genera. 



a. Tan nearly even; upperwing-coverts white; ^^^ ^^^^^^^^^^^^^^^^ 



SIZG IRPgc ,.••••••■• ' 



b. Tail not even, but distinctly graduated. 



6'. Tertialsratlier broad; upper wing-coverts 



blue ; size large .• • • ^1- Cyanochen, p. 139. 



c'. Tertials long and narrow ; upper wing- 



coverts grey ; size small 22. Chenonetta, p. 140. 



20. CHLOEPHAGA. ,j^ 



Chloephaga, Ei/t. Man. Anat. p. 13 (1838) 0. magelfanica. 



Tffinidiestes>cA«6. Av. Syst. Nat. p. ix (1852) . . . C. antarctica. 

 0?essocben>a««. Pr. Ac' Sc. Philad. 1870 p. 131 C. melanoptera. 

 Chloet^rophus, l^-^-J;- ^<;- f- ^^'^«'^; . '_'[''[ c. poUocephala. 

 CUoophaga", 'Sund. Metii. nat. Av. disp. Tent. p. 14-5 



Tffinidiesthes, Heine, Nomencl. Mus. Hein. Orw.p. 342 



(1890). 

 Ranc/e. Confined to South America. 



Key to the Species. 



a. Under tail-coverts white. 



a'. General plumage white, with no barrmgs. 

 a". Upper scapulars white, each with a 



black spot along the middle melanoptei-a, p. 129. 



b". Scapulars like the rest of the plumage, 

 white ; in specimens not fully adult the 

 primaries are black towards the tip . . hybnda 6, P- i3U. 

 v. Plumage more or less barred. 



c". Scapulars brown-black; breast with 



deep black and white barrings; tail , , ., ^ ^_ 



entirely white hybnda $ , p. 130. 



d". Scapulars grey ; head pale grey. 



d'". Breast entirely white •_• • magellamca S, P- 132. 



e'". Breast more or less barred with 



\^\^(.\ inornata S > P- 134. 



6. Under tail-coverts more or less blackish; 

 plumage distinctly barred with black and 



c'.^Head distinctly rufous magellanica ? , p. 132. 



d'. Head greyish, scarcely tinged with rufous, inornata J , p. 134. 

 c. linder tail-coverts rufous-cinnamon. 

 e'. Head rufous hke the middle of the 



abdomen • • • • rubidiceps,^. 136. 



f Head grey, middle of the breast and abdo- 



■^ menwhite pohocephala, ■p. 137. 



