130 COKVIDJi. 



Cvanocorax peruauus, Cub. t. c. p. 232. 



C'viiuocorax vncas, (riay, Gen. B. ii. p. 307 ; SM. 3lus. P.-B. Curaces, 



■p. 53. 

 Xauthoura peruviana, Bp. Consp. i. p. 380. 

 Xanthocitta peruviaua, Cab. Mks. Hein. Tli. i. p. 223. 

 Cvanocorax iucas, Scl. P. Z. S. 1854, p. 114, 1858, p. 72 ; id. Cat. Amer. 



' B. p. 144 ; Scl. ^ Salt. Nomencl. Av. Neotr. p. 39. 

 Cyanurus yncas, Gray, Hand-l. B. ii. p. 5. 

 Xantbura peruviana, Taczan. P. Z. S. 1874, p. 524. 

 Cvanocorax yncas, var. cyanodorsalis, Dubois, Bidl. Acad. Brujc. 



xxxviii. p. 492. 

 Xanthoura incas, vai . incas, Baird, Brewer, 4" Pidyic. N.-Amer. B. 

 ii. p. 295. 



Adult. Above bright green, slightly yello-wish ; the wings rather 

 darker green than the back, the qnills bronzy towards the tips of 

 the outer webs ; two centre tail-feathers dark green, with a shade of 

 indigo, all the rest of the feathers bright yellow ; frontal plumes (re- 

 curred) and nasal bristles deep cobalt, as also a small spot above the 

 eye, the feathers below the latter and the cheeks also deep cobalt ; 

 the I'est of the sides of the face, lores, throat, and fore neck black, 

 with a slight shade of blue on the upper chin ; crown of the head, 

 from the fore part of the head to the hind neck, ivory-yellow, with a 

 dash of brighter yellow and a shade of lilac under certain lights, the 

 hinder neck bright yellow where it adjoins the green back ; rest of 

 under surface of body bright yellow, some of the plumes of the 

 lower throat black, tipped with yellow ; under wing-coverts bright 

 yellow, as also the inner webs of the quiUs. Total length 11-3 inches, 

 culmen 1"15, wing 5-05, tail 6-2, tarsus 1"65. 



Obs. Ecuadorian specimens are smaller than Brazilian, and have 

 quite a distinct shade of lilac-blue on the head and hind neck, es- 

 pecially near the mantle. Total length 10-5 inches, culmeu 1, 

 wing 4-6, tail 5-8, tarsus 1-45. Dr. Dubois has given a name to 

 this form ; but it is the true C. ifncc(S (cf. PI. Enl. pi. 625), and the 

 character is by no means strongly pronounced in a large series. 



Hab. "Western South America, from Peru to Ecuador. 



2. Xanthura caeruleocephala. 



Cyanocorax yncas, var. y. caeruleocephala, Dubois, Bull. Acad. Buy. 

 Belg. xxxviii. p. 493. 



Adult. General colour above gi'een, washed with bluish green on 

 the upper tail-coverts ; Avings green, like the back, the inner webs 

 of the quills dusky brown, the primaries somewhat tinged with yel- 

 low towards the tips of the outer webs; four centre tail-feathers 



