THE IBIS. 



TENTH SERIES. 



Vol. V. No. 4. OCTOBER 1917. 



XXV. — On a new South American Jay of the Genus 

 Cjanolyca. By W. L. Sclater, M.B.O.U. 



(Plate VIII.) 



While rearranging and cataloguing the collection of 

 Corvidse in the Natural History Museum I came across 

 this hitherto uncharacterized form of South American Jay, 

 which I propose to name and describe as follows : — 



Cyanolyca viridicyanea ciizcoensis, subsp. no v. 

 (Plate VIII. fig. 1.) 



Resembling C. v. viridicyanea, but with the chin and 

 throat a rich ultramarine blue instead of black, faintly 

 washed with greenish indigo ; general colour above and 

 below bright blue with hardly any trace of the greenish 

 shade characteristic of the typical form; as regards the 

 white on the head, the black frontal band, the black on 

 the sides of the face, and the narrow line of white and 

 black separating the ultramarine blue or blackish indigo 

 of the throat from the brighter azure blue of the rest of 

 the uuderparts, it agrees with the typical form. 



In dimensions the two forms are almost identical, the 

 wing-measurements of four examples of C. v. cuzcoensis 

 averaging 135 mm., of five C. v. viridicyanea averaging 

 139 mm. 



SEll. X.— VOL. Y. 2 I 



