Species of the Family Icteridse. 155 



caudse flavse rectricibiis duabus raediis et paris proximi 

 pogoniis interuis^necnon rectricibus duabiis externis totis 

 olivaceis, ceteris flavis olivaceo terminatis ; rostro plum- 

 beo, apice albicante ; pedibus nigris : long, tota \7o, 

 alffi 9"3_, alae 7'Q. 

 Hah. Venezuela (?). 



Under the name oleag'meus I find it necessary to separate 

 a single specimen that has been in my collection since 1857, 

 and was referred doubtfully to O. atrovirens in my American 

 Catalogue. Its generally olive-green colour^ which extends 

 specially over the outer margins of the wings, renders it easily 

 distinguishable from the three preceding forms ; besides which 

 it has a plumbeous bill (passing into white in the apical por- 

 tion) and no yellow on the front. The yellow front, however, 

 is occasionally wanting in O. atrovirens. 0. oleag'meus has a 

 slight pendent crest on the vertex, like O. atrocastaneus and 

 others of the group. 



12. OSTINOPS ANGUSTIFRONS. 



Cassicus angustifrons, Spix, Av. Bras. i. p. 68, pi. 62 ; Bp. 



Consp. p. 427 ; Cass. Pr. Ac. Phil. 1867, p. 70. 



Ostinops angustifrons, Scl. Cat. A. B. p. 128 ; Scl. et Salv. 



P. Z. S. 1866, p. 182, et 1873, p. 265 ; Nomencl. p. 35 ; Cab. 



J. f. O. 1873, p. 308. 



Supra saturate olivaceo-brunneus, capite viridescentiore, dorso 

 postico in fulvum transeunte ; alls nigricantibus, harum 

 secundariis et tectricibus extus dorso concoloribus : sub- 

 tiis concolor, sed paulo dilutior, in gutture virescens ; 

 crisso uropygio concolori ; caudie flava3 rectricibus dua- 

 bus mediis totis, paris proximi pogoniis iuternis et rec- 

 tricum lateralium apicibus nigricantibus; rostro et pedi- 

 bus nigris : long, tota 17*5, tdse 9, caudse 7'7 ; long, tota 

 (fem.) 14, alse 7*2; caudae 6'2. 

 Hub. Amazonia superior. Sarayacu, Upper and Lower 



Ucayali and Huallaga [Bartlt tt) ; Sarayacu, Ecuador {Buckley) : 



Colombia int. (Bogota) . 



The uniform dark bill of this Cassique renders it easily 



distinguishable fi'om its allies. It is a common bird on the 



Upper Amazons, whence I have seen numerous specimens. 



Bogota skins do not materially ditt'er. 



