On a new genus ofPsittacidce. 387 



formantibus. Rectrices griseae, interne ad basin albae ; inferiores 

 ad basin albae apice giisescentes. Longitude corporis, 1 pes, 

 2 f unc. ; alee a carpo ad remigem 2clam, ^to' ca?<rfa?, 9 ; mandi- 

 bulce superioris ad frontem, ■—, ad rictum, ^ ; inferioris -^^ ; 

 tarsi. 1 rrTT- 



Habitat in Africa. 



** Remige 3tid longissima. 

 FuucATUs. N. albus, dorso medioj alts, rectridbusque nigris^ 

 purpureo nitentibus. 



Rostrum nigrum ; cera pedesqne flavl. Ptila purpureo-atra ; 

 tectrices inferiores albae : remiges secundaria?, pteromata, scapu- 

 laresqne albo-variegatae. Longitude corporis, 1 pes, 10 unc. ; 

 alee a carpo ad remigem 3tiam, l pes, 4 unc. ; caudce, 1 peS; 1 

 unc, ; mandibulce superioris, ad frontem, 1 ^^, ad rictum, 1 | ; 

 tarsi, 1 |. 



Habitat in Mundo Novo. 



There is a material difference in the construction of the wing 

 in these two birds. In the latter or the American species the 

 third quill feather is the longest, the first and second are marked 

 by an abrupt emargination in the inner web, and the second 

 third and fourth by a gradual decrease in breadth of the outer 

 web towards the apex. On the other hand the African species 

 has the second quill feather the longest, with a slight emargina- 

 tion only towards the apex of the first and second feathers, while 

 the outer webs of all are nearly even throughout. In consequence 

 of these characters N. Riocourii comes most nearly to the group 

 of Elanus, while N.furcatus shows an approximation to the true 

 Milvus. 



ON A NEW GENUS OF PSITTACIDJE. 



Among the primary groups or subfamilies into which the 

 Parrots appear to be divided, two of the most conspicuous, as I 

 have elsewhere observed, are the birds which we familiarly call 

 Maccaws, and those commonly known under the name of long- 



2 b2 



