120 



Key to the S^iecics. 



a. MidtUe tail-feathers tipped with white ; breast white 



or yellowish ; a blue or white spot above the eye, 

 another below the latter, and a third on the fore 

 part of the cheeks. 

 a'. Outer tail-feather resembling- the others, violet 

 with a white tip. 

 a". Hinder neck purplish blue ; nape and spot 



above the eye rich cobalt ; occipital crest , ^j^y,^gg„g „ ^20 



thick and velVety 1 aiesinffi,'^. 121. " 



6". Hinder neck and nape purplish, with no velvety i f,^,^-, p ^21. 



crest; spot above the eye purplish cobalt j g^iatm n. 122. 



c". Hinder neck and nape whitish ; spots above 



and below the eyes and cheek-spot also whitish , ^^y„,„^, p_ ^22. 



shaded with blue j i,{tcrmedim, ""'" 



b'. Outer tail-feather reserabling the others, black p. 123. 



with a white tip ; hinder neck bluish white ; 

 crest very long, equal to the culmen in length. . cyanopogon,^.\2?j. 

 c'. Outer tail-feather entirely white, the middle ones 



blue, tipped with white mystacalis, p. 124. 



b. Tail uniform ; no white tips to any of the feathers. 

 d'. Forehead uniform with the crown ; no white 



line across the sinciput. 

 d". Back brown, the hind neck uniform. 



a"'. Throat and fore neck brown qianomelas, p. 124. 



V". Throat and fore neck black chilends, p. 125. 



e". Back pale violet, as also the under surface; 



hind neck lighter violet violaceus, p. 125. 



/". Back purplish blue, as also the under surface; , ^^,.„; „. i2r. 



head and neck all roimd black j heckeli. p. 126. 



«', Forehead black, succeeded by a white line across 

 the sinciput. 

 g ". Throat blackish. 



c'". Size larger : wing 5'35 inches ; hinder cro-wni 

 and nape bright cobalt, separated from fore- 

 head by a broad line of white, which runs 



also along the sides of the crown oniafus, p. 127. 



d'". Size smaller: wing4-55 inches; hinder crown 

 and nape deep blue, scarcely at all darker 



than the back pumilo, p. 127. 



h'\ Throat silvery greyish white, tinged with blue argeiitigula,^.l28. 



1. Cyanocorax chrysops. 



Acah6, A^ra, Apunt. i. p. 253. 



Pica chrysops, Vieill. N. Diet. d'Hist. Nat. xxvi. p. 124 {ex Azara) ; 



id. Gal. Ois. i. p. 157, pi. 101. . 

 Corvus pileatus, Teinni. PL Col. ii. pi. 58 (ex Illig.). 

 Cyanocorax pileatus, Boie, Isis, 1826, p. 975 ; Gray, Gen. B. ii. p. 



307; Burm. Th. Bras. ii. p. 284; Heme, J. f. O. 1860, p. 114; 



ScM. Mils. P.-B. Coraces, p. 52; Pck. Orn. Bras. p. 189; Scl. ^ 



Salv. Nomencl. Av. Neotr. p. 39. 



