CALLISTE GYROLOIDES. 



THE BLUE-BACKED GREEN TANAGER. 



PLATE XXVI. 



Aglaia gyrola Lafr. et d'Orb. Syn. Av. in Mag. de Zool. 1837, 



p. 32. 



Tanagra gyrola d'Orb. Voy. p. 272. 



Aglaia peruviana Swains. An. in Men. p. 356, 



Callospiza gyrola .... Tsch. in Wiegm. Arch. 1844, p. 286 ; Faun. Per. 

 p. 202. 



CaUiste cyanoventris . . Gray, Gen. p. 366. sp. 19, 



Aglaia gyroloides .... Lafr. Rev. Zool. 1847, p. 277. 



CaUiste gyroloides . . . , Gray, Gen, App, p, 17. 

 Bp. Consp. p, 234, sp, 5, 

 Sclater, Contr, Orn, 1851, p, 67; P. Z. S. 1854, 



p. 115; 1855, p. 158; et 1856, pp. 142 et 255. 

 Cassin, Rep. U. S. Astr. Exp. ii. p. 182. pi, 19. 



fig, 1. 



Gyrola cyanoventris . , Bp. Rev, et Mag. de Zool, 1851, p. 139 ; Note s. 1. 

 Tang. p. 13. 



Mas adultus. Clare viridis : capita et mento summo 'castaneis : 

 torque nucliali et campteriis aurescentibus : dorse postico et 

 abdomine toto cseruleis : tibiis pallide rufis : rostro et pedibus 

 nigro-fuscis : long, tota 5*0, alse 2*9, caudse 1*8 poll. Angl. 



Foemina. Mari similis sed minus splendens et minus cserulescens. 



Neither Lafresnaye and d'Orbigny nor Tschudi in their several 

 works upon the Zoology of Bolivia and Peru recognized the distinct- 

 ness of this Tanager from the corresponding species of Cayenne and 

 Guiana — the true gyrola of the older authors. Mr. Svi^ainson was, 

 hovpever, as I have already stated, well acquainted vdth all the three 

 species of this section, and conferred on the present bird the specific 

 title peruviana. And this name would be properly employed for 

 it, were not confusion thereby likely to be caused ; another species 

 {CaUiste 7nelanonota) having been previously called peruviana by 

 Desmarest in 1808. Under these circumstances, therefore, we are 



