ANAS. - CHAULELASMUS. 125 



Genus ANAS, Brisson, Ornith. vi. p. 307 (1760). 



Anas = a Duck, in classical Latin; akin to viJTTa, vrjffffa, vaffffa, Germ. 

 Ente, Lith. dntis. > : 



Anas boscas. WILD DUCK. 



Anas Boschas, Linnaus, S. N. i. p. 205 (1766). 

 Anas boschas, Macg. v. p. 31 ; Naum. xi. p. 575 ; Hewitson, 



p. 407 ; Gray, p. 193 ; Yarr. ed. 2, iii. p. 264 ; id. ed. 3, 



iii. p. 265; Gould, v. pi. 15 ; Harting, p. 62; Dresser, 



vi. p. 469. 

 The Wild Duck, Yarr. ed. 1, iii. p. 169. 



Boscas = floated?, a small kind of Duck in Aristotle ; apparently the genuine 

 forms are (3a<TKas and QavKcis. Origin unknown (cf. H. T. Wharton, ' Ibis,' 

 1879, p. 452) ; perhaps confused with (BoffKio = I feed, in popular etymology. 



Resident and generally distributed. It inhabits both the 

 Palaearctic and Nearctie Regions. 



Genus CHAULELASMUS, G. R. Gray, Gen. B, iii 

 p. 617 (1845). 



Chaulelasmus, from %av\6s = loose or gaping ; a word only found in classical 

 Greek in composition, ^auXio^ous = with outstanding teeth ; and eXctfffios =. 

 metal beaten out, a metal plate, from e\avv<t) = I drive, strike, beat out. From 

 the projecting laminae of the upper mandible. 



Chaulelasmus streperus. GADWALL. 



Anas strepera, Linnaus, S. N. i. p. 200 (1766). 



Querquedula strepera, Macg. v. p. 59. 



Anas strepera, Naum. xi. p. 659 ; Hewitson, p. 402 ; Yarr. 



ed. 2, iii. p. 249 ; id. ed. 3, iii. p. 254 ; Harting, p. 62. 

 Chaulelasmus strepera, Gray, p. 196 ; Gould, v. pi. 19. 

 Chaulelasmus streperus, Dresser, vi. p. 487. 

 The Gadwall, Yarr. ed. 1, iii. p. 154. 



Streperus = noisy. 



The Gadwall occurs somewhat sparingly from autumn to 

 spring on the coasts and waters of the United Kingdom, 

 and is known to breed in Norfolk. It inhabits the Palae- 

 arctic and Nearctie Regions. 



