ON TWO HYBIUD DUCKS. 27 



(( Passaiira » (Vallo Zappa. — Von. Est.) thc 13"" of Novem- 

 ber 1893, sliiired by Mr. Bonomi and kept in my Gollection 

 n'" 1072. — It offers a very distinct colour of a metallic- 

 green round and above the eyes as far as towards nape, on 

 the temporal region a space of the sanie colour ; on the 

 mesial line of nape as far as the beginning of the back and 

 on the last feathers of pileum towards nape are seen 

 bottle-green-black tints formed by the top of each separate 

 feather ; sides of the upper portion of neck, lores and 

 cheeks chestnut, the latter spotted with black ; chin, 

 throat, partly the neck and sides deep-black. Among the 

 several thousands of Wigeons I have killed orexamined, 

 I have found very few specimens like this and so old. 



h. Specimens cf tid. with green tints only beyond and 

 round the eye black hue on the cheeks more or less 

 extended. Many authors speak of them (Savi, Olphe Gail- 

 lard, Salvadori, etc.) and they are very easily found. 



c. Specimens (^ ad. with only chin black; neck chest- 

 nut with small black dots on the sides of head ; pileum 

 butf ; there is absolutely no green colour (n""" 332 my Gol- 

 lection). Pretty common. 



d. Specimens cf ad. in moulting-plumage with green 

 shades on the dark tints of pileum and nape (several 

 specimens in my collection). Gommon. 



e. Specimens cf jiiv. which have not yet white wing- 

 coverts with green tints more or less extended and devc- 

 loped. Gommon. 



/'. Specimens 9 with boltle-green tints of head and 

 sides (three specimens in my collection). Not very com- 

 mon. 



\\ heu specimens are moulting, they mostly offer such 

 green lints, which however I have never observed in 

 young ones in their first plumage, namely in that dress 

 by which the males differ from the females especially by 

 the metallic-green colour of wing-speculum. 



M. Suchelel (1) observes tlial llie wkig-speculum in 



(1) Loc. cit., p. 63G of the Ext. 



