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ART. XIT. — Descriptions of new species of PsiTTACiDiE, in the collection of the Academy 



of Natural Sciences of Philadelphia. 



By John Cassin. 



1. Ara auricollis, Cassin, Proc. Acad. Nat. Sci., Philada. vi. p. 372. (June, 1853.) 



Ara auritorques, Massena et Souance, Rev. et Mag. de Zool., 1854, p. 71, (Feb.) 



Sittace primoli, Bonaparte, Rev. et Mag. de Zool., 1854, p. 147. 



PLATE XII. Adult. 



Form. — Rather smaller than Ara severa, (Linn.) Bill abruptly curved, culmen 

 flattened, bare space commencing at the nostril, including the eye and completely 

 inclosing the under mandible. Wing rather long, second and third quills longest and 

 nearly equal ; tail graduated, containing twelve feathers. 



Dimensions. — Total length (of skin) from tip of bill to end of tail about 15 inches, 

 wing 8i, tail 8 \ inches. 



Colors. — A large spot of yellow on the back of the neck, somewhat rectangular in 

 shape, and extending slightly on to the sides of the neck at its lower edge. 



Head above, from the base of the bill to the crown, black, which is also the color 

 of the cheeks immediately next to the bare space. Occiput and all other parts of the 

 plumage, except the wings and tail, green, tinged with yellowish on the back and 

 wing coverts, and very slightly with bluish on the occiput. Primaries and secondaries 

 light blue ; tertiaries same yellowish green as other plumage. Tail with the two cen- 

 tral feathers on their upper surface reddish chestnut or maroon for the greater part of 

 their length, yellowish green at base, and towards the end subterminally light blue 

 and narrowly tipped with yellow! Other feathers of the tail much the same, but 

 with the light blue predominating on their outer webs, and yellowish green on their 

 inner webs. Under surfaces of wings and tail pale silky yellow. 



Hah. — South America ; Bolivia. 



Ohs. — Peculiarly characterized by the large yellow patch on the neck behind, and 

 bearing no very near relationship to any species known to me. Three specimens, very 

 similar in plumage, are in the collection of the Academy, two of which have been 

 labelled in Europe as natives of Bolivia, the other is without label. 



2. Chrysotis viridtgenalis, Cassin, Proc. Acad. Nat. Sci., Philada., vi. p. 371. 



(June, 1853.) 



PLATE XIII. Adult Male. 



Form. — About the size of G. autumnalis, (Linn.) Bill strong, culmen curved from 

 the base and slightly grooved. Wing with the second, third and fourth quills longest 



