692 Messrs. Sclater ayid Mackvvortli-Praed on [Ibis, 



beJieved it to be a matter of youth and age. We cannot 

 help suspecting tliat Antinori^s birds were not carefully 

 sexed and that Salvadori was misled by this. 



We find that the type of the genus Nauclerus Vigors 

 (Zool. Journ. ii. 1825, p. 386) is undoubtedly (by subse- 

 quent designation of Gray, List Gen. Bds, 1840, p. 4) 

 Falcu forficatus Linn., the American Swallow-tailed Kite, 

 and is therefore a synonym of Eluno'ides of Vieillot. We 

 are therefore forced to fall back oji Chelictinia Lesson (Echo 

 du Monde Savant, 1843, p. 6), the type of which is un- 

 doubtedly the present species. 



Haliaetus vocifer. 



Falco vocifer Daudin, Traite, ii. 1800, p. 65 : Coasts of 

 Cape Colony (ex Levaillant). 



Haliaetus vocifer Reiciiw. V. xV. i. p. 605; Butler, Ibis, 

 1905, p. 366, 1908, p. 251. 



[B. coll.] 1 Sobat river May, Kas. 



[C. & L. coll.] 1 Karaisa Dec. Sen. ; 1 near Lake No 

 Feb. U.N. 



In the J. f. O. 1910, pp. 388-390, Zedlitz, following Brehm 

 and Heuglin, has separated the race from the Sudan and 

 north-east Africa, under the name H. v. damans Brehra. 

 His wing-measurements for ihis race are ^ 505, ? 530 mm., 

 while those for the east and south African race are given as 

 (J 520-550, ? 563-580 mm. Our own adult specimens, 

 both males, from the eastern Sudan measure 528 and 

 535 nun., and so come within the limits of the lai'ger race. 

 We therefore prefer to keep the two forms united at present. 



Terathopius ecaudatus. 



Falco ecaudatus Daudin, Traite, ii. 1800, p. 54: " Anteni- 

 quoi country,^' i. e. Kuysna district, Cape Colony. 



Helotarsus ecaudatus Reichw. V. A. i. p. 598 ; Butler, 

 Ibis, 1905, p. 366, 1908, p. 251, 1909, p. 402. 



[B. coll.] 1 Abu Sheneina May, Sen. 



This is an old male of the light-backed form, known as 

 T. leuconotus Riipp,. and is apparently only a variety or 



