164 Mr. P. L. Sclater on the 



Enc. Meth. p. 713; Cassin, Pr. Ac. Sc. Phil. 1866, p. 11; 

 Hartl. Ind. Azara, p. 5 (Paraguay). 



Icterus unicolor, Licht. Doubl. p. 19; Max. Beitr. iii. 

 p. 1208 (Bahia and Minas). 



Icterus sulcirostris, Spix, Av. Bras. i. p. 67, pi. 6 J. f. 2 

 (Minas). 



Af/elanis sulcirostris, Sw. An. in Menag. p. 303. 



Aphobus chopi, Cab. Mus. Hein. i. p. 194'; Scl. Cat. A. B. 

 p. 141 ; Cabanis, J. f. O. 1874, p. 85 (Cantagallo, Rio) ; 

 Hamilton, Ibis, 1871, p. 303 (S. Paulo); Tacz. P.Z.S. 1877, 

 p. 323 (Tumbez, W. Peru) et p. 750 (W. Pern) ; Forbes, 

 Ibis, 1881, p. 339 (Pernambuco) ; Scl. et Salv. Nomencl. 

 p. 39. 



Psarocolius unicolor, Bnrm. Syst. Ueb. iii. p. 281, et La 

 Plata Reise, ii. p. 494 (Mendoza). 



Nigro-nitens unicolor ; rostro et pedibus nigris, rostro infe- 

 riore longitudinabter sulcato : long, tota 92, alse 5*2, 

 caudse vix rotundatse 4*0. Fern. Miniis nitens, cras- 

 sitie minore et rostro non sulcato. 



Hub. Paraguay, Nortbern La Plata and Southern Brazil 

 northwards to Pernambuco : also Western Peru. 



Mus. P. L. S. et S.-G. 



There are perhaps two forms of this species, a stronger 

 southern form from Paraguay and South Brazil [A. chopi), 

 and a weaker northern form from S.E. Brazil (Bahia and 

 Pernambuco), A. sulcirostris. I have not been able to exa- 

 mine Peruvian examples. 



Genus VIII. Cassidix. 



Scaphidurus, Sw. Faun. Bor.-Am. Aves, p. 494 (1831, nee 

 Sw. 1827) : type C. oryzivora. 



Cassidix, Less. Trait. d^Orn. i. p. 433 (1831) : type C. ory- 

 zivora. 



Scaphidura, Sw. Class. B. ii. p. 272 (1837) : type C. oryzi- 

 vora. 

 Although I here follow Dr. Cabanis in associating this 



genus with the Quiscalinse, I must confess that I think it 



would be better placed with the Cassicinee, with which it 



