





■ I 



I , I 



X 





h:'': 



838 



EEVIEW OP AMERICAN BIRDS. 



[part I. 



In a pretty extensive series of speeimeus of South Anioricnn 

 VireoH, wliicb liave been referred to V. vhivi, ayilis, barlramii, iic. 

 of authors, supposed to be Hyuoiiyiiis of the same species, I find 

 considerable differences which uppurfiitiy indicate tlie presence of 

 two or even three species, differing almost too much in size and 

 coloration to be considered the same. I have therefore selected tiie 

 specimens from Captain Page's I'arnguay expedition as typical of 

 the oldest name, V. chivi, based on Azara's descriptions. These 

 specimens, two in number, agree with Azara's bird in the small sizt>; 

 the coloration is less intense than in the rest, the y«'llow of the under 

 parts being not much brighter than in oliraccvs, but as a sjiring 

 plumage this is to be expected, if, as is probable, Azara's descrip- 

 tion was taken from autumnal birds. 



The groat inferiority in size to V. olivacetis, and the difference in 

 the wing formula, will at once distinguish this sjn-cics or race. Tlie 

 coloration of No. 10,340 is almost precisely that of No. 1,418, the 

 type of the description of V. olivaceus, the olive being only a little 

 deeper, the axillars brighter yellow. 



If there are two species of South American Vireos of the rhiri 

 type, as suggested, the more southern appears to be the smaller 

 and the northern one the larger, although not closely restricted. 

 Thus a specimen in the collection labelled " Buenos Ayres," possibly 

 erroneously, however, is as large as the largest, while two from 

 Bahia are as small as the La Plata skins described. 



Locality. 



Babia, Brazil. 



Brazil. 

 VernMJo Blver. 



Wlien 

 Collected. 



Received from 



Collected by 



Oct. 18.19. 

 Feb. 1860. 



Dr. G.jCaliHnis. 

 Cab. Lawrence. 

 Capt. Pave. Expl. 

 " [of Parana. 



Chr. Wood. 



TireosylTia agilis. < 



)- Lanitis agilis, Light. Yen. Donbl. 1823, no. 526 (Bahia, Brazil).— 



fThamnnphihis arfilis, Spix, Av. Bras. II, tab. xxxiv, fig. 1. — Phyllo- 

 manes nyilis, Bdbm. Th. Bras. Voefl, II, 1856, 108. — Vireosijlvia 



agilis, Sclatbr, P. Z. S. 1860, 64,273 (Ecuador) Ib. Catal. 18C1, 



44, no. 263 (Bogota, etc.). 



Vireo hartramii, Swainson, F. B. A. II, 1831, 23.') (not of Am.). 



Vireosylrin vireacens, Caspin, Pr. A. N. Sc. 18.51, l.*)!. — Sclatkr, P. Z. S. 

 18.')5, I.*)! (Bogota). — Vireo virescens, Baird, Birds N. Am. 1858, 

 333 (Brazil), not of Vieill. 



Hab. South America ; south to Buenos Ayres, Ecuador, Guatemala. 



