57. EEISMATTJEA. 441 



57. ERISMATURA. 



Type. 



Oxyura (subgen.), Bp. Ann. Lye. N. 1 . ii. (1826), 

 p. 390 (1828) {nee Oxyurus, ISw. 1827) E. jamaicensis. 



Erismatura, Bj). Sayg. Distr. Met., Ayg. e Corr. 

 p. 143 (1832) E. jamaicensis. 



Cerconectes, Wayl. Jgis, 1832, p. 282 E. leucocepbala. 



Gymnura (sub^ea.), Niitt. Ma?i. ii. p. 42G (1834) . . E. jamaicensis. 



Undina, Gould, B. of Eur. v. pi. 383 (1837) E. leucocepbala. 



Bythonessa, Gloyer, Hand- u. Hilfsh. p. 412 (1842). E. leucocephala. 



Erimistura ierrore?), Deyl. >^- Gerbe, Or?i. Eur. ii. 

 p. 565 (1867). 



Range. Almost cosmopolitan. 



Key to the Sjoecies. 



a. Breast, and usually also the back and flanks, 



bright chestnut (Adult Males). 

 a'. Head partly white. 



a". Head white, crown black leucocephala, p. 442. 



d". Cheeks and chin white, upper part of the 



head to the occiput black jamaicensis, p. 44-5. 



b'. Head and upper part of the neck wholly 

 black. 



c". Axillaries white maccoa, p. 448. 



d''. Axillaries greyish brown, edged with 

 white. 

 a'". Chin white. 



a*. Under tail-coverts rusty red ferruginea, p. 449. 



b^. Under tail-coverts white cequatorialis, p. 450. 



b'". Chin like the head black. 



c^. Chestnut colour of the breast, flanks, 

 and upper parts lighter and 



brighter vittata, p. 4-50. 



d^. Chestnut colour of the breast, flanks, 



and upper parts deeper aitstralis, p. 451. 



b. Breast and upper parts not bright or deep 



chestnut, always more or less freckled or 

 ban-ed with brown (Females and Youny). 

 c'. Upper mandible at base decidedly swollen on 

 the sides ; usually upper parts distinctly 



tinged with chestnut-brown leucocephala, p. 442. 



d'. Upper mandible not swollen basally on the 



sides. 



e". Cheeks not uniform with the upper part 



of the head, but crossed below the eyes 



by a whitish band from the biU to the 



occiput. 



c'". Under tail-coverts whitish, not 



sharply defined from the remainder 



of the abdomen maccoa, p. 448. 



d'". Under tail-coverts pure white, sharply 

 defined from the remainder of the 

 abdomen, 

 e'. Bill across at broadest point O-SO-0-90 



inch jamaicensis, p. 445. 



