390 Mr. Vigors' s Sketches in Ornitholdg?/, 



of the extreme species, such as Ps» llligerij Temm. arid Kuhl, and 

 Ts. makawuanna, Gmel., a smaller portion of the cheeks is bare. 

 On the other hand, in the typical species of the genus Psittacara, 

 the orbits of the eyes only are naked. With reference to the 

 same character the species now under consideration is precisely 

 intermediate between both. While the orbits of the eyes are 

 naked, but the cheeks clothed, as in Psitiacara, the space be- 

 tween the eyes and bill is bare, by which means it nearly meets 

 the above mentioned extreme species of the Maccaws. It is one 

 of those species in fact, which may, with equal justice, be referred 

 to either of the neighbouring groups which it connects, according 

 to the will of the naturalist; and it is interesting as it exemplifies 

 the arbitrary character of the divisions, which we are forced to 

 institute for the sake of convenience, while nature herself exhibits 

 no break. The exact concordance of the species with the present 

 group in the structure of the wing, in which respect it slightly 

 differs from the Maccaws^ induces me to prefer for it the station 

 which I have now assigned it. 



LicHTENSTEiNii. Ps. viridts^ capite nigrescenti-brunneo, postice 

 aureo'-variegato ; fascid frontali angustd, regione paroiicA, 

 abdomine medioy uropygio^ cauddque infra castaneo-pur' 

 pm^eis; torque nuchali pectoreque cceruleis ; humeris coc- 

 cineis. 



Capitis plumae nigrescenti-brunneae, posticae apice aureo-margi- 

 nata;, maculam auream utrinque pone aures formantes. RemigeSy 

 primariae supra caeruleae, prima quae est caeruleo-atra excepta, 

 pogoniis internis ad basin flavo-fuscis, ad apicem atris ; secundariae 

 virides, interne ad basin flavo-fuscae; omnes inferiores fuscae, ad 

 basin interne flavo-fusco marginatae. Ptila inferiora viridia; 

 pteromata inferiora flavo-fusca. Longitudo corporis, 10^ ; alcB 

 a carpoad remigem 2damj 6_2^ ; caudw, 5^; mandibular superioris 

 ad frontem, i.^, ad rictum, ^; inferioris, ^; tarsi, !•: altitude 

 rosiri, ^. 



In honorem Zoologiae Professoris Berolinensis celeberrimi, 

 Ornithologiae peritissimi, hx'c avis noniinatur. 



