On a new genus of Psittacidce. 389 



compressa, inferiore brevissima iutrorsum inclinante, profunde 

 emarginata. 



yllee mediocres ; remige Im^ et 4ta aequalibus, Stisi paulo lon- 

 giore, Sda longissima : primae pogonio interno leviter prope me- 

 dium emarginato ; secundae ad quintam inclusam pogoniis externis 

 in medio gradatim latioribus. 



Cauda longa, gradata. 



Pedes subfortes, tarsis brevibus. 



The Psittacus Guianensis of Linntsus, the Perruche-Ara 

 Pavouune of M. Le Vaillant [PI. 14. 15.] may be selected as the 

 type of this genus. To this may be added the following species, 

 which accurately accord with the general characters of the genus, 

 but in which the naked space round the eye is more contracted ; 

 P. squamosus. Lath., [Nat. Misc. t. 1061]; P. versicolor, Lath., 

 [PI. Enl. 144. Le Vaill. pi. 16] ; P. vittatus^ Shaw, [Le Vaill. 

 pi. 17] ; together with the P. auricapillus and P. leucotis of M. 

 Lichtenstein. I have lately received the following birds from 

 Brazil, which are also referable to the group, although, from the 

 difference in the extent of the naked space round the eye of each, 

 they appear to occupy different stations in it. 



FuoNTATUs. Ps. viridis, capitis fronte ca^ruleo, humeris coccineis; 

 spatio inter oculos rostrurnque nudo. 



Alee caudaqne supra virides, subtus flavescenti-fuscce. Ptila 

 inferiora coccinea. Longitude corporis^ 12^ unc. ; ala; a carpo 

 ad remigem 2«^am^ 6_«_ ; caudw, 6-^^ ; mandibular superioris ad 

 frontem, 1 ^-^, ad rictum, -^ ; inferioris, -^^ ; tarsi, -^^ : altitudo 

 rostrif 1 -1^. 



As in taking a comprehensive view of the two great subdivisions 

 now before us of this family, the present genus is seen to form the 

 bond of connection between them ; in like manner, when we de- 

 scend to particulars, the species now described will be found to 

 be the immediate link between the extreme species of each. On 

 looking to the character of the naked cheeks of the Maccaws^ we 

 perceive that in the typical species of that subfamily, the naked- 

 ness extends all round the eyes and over the cheeks, while in some 



