OPISTHOLOPHUS. — OREICOCA. 
747 
Sasa cristata Vieillot, Galerie Oiseaux II. 326. Tb. 193. 
Opisthocomus hoazin Gray, Handl. Birds II. 126. 
OPISTHOLOPHUS ( Palamedeidae. — OTCiràoXoçoç occiput cristatum) Vieillot, 
Analyse 1816. 60. = Palamedea Lin. 
Bec plus court que la tête, garni de petites plumes à la base, conicoconvexe, 
un peu voûté, courbé à la pointe. Tête simple. Lorum nu. Ailes éperonnées. 
Doigts extérieurs unis à la base par une membrane; pouce portant à terre sur le 
bout. Ongles postérieur et intermédiaire à peu près droits. Queue étagée. 
fidelis Vieillot, Galerie Oiseaux Tb. 262. = Palamedea chavaria Tem. 
OPISTHOPR0RA (Lesbiinae. — omtöov postice, 7cp<opa pars antica) Cabanis, 
Mus. Heine. 1860. III. 76. = Polytmus Briss. 
Syno?i.: Avocettinus Bonap. 
eurypterus Cabanis, Mus. Heine. III. 76. = Polytmus eurypterus Gray. 
0P0PSITTA diophthalma Sclater, Proc. Zool. Soc. 1860. 217. = Psittacula 
diophthalma HJ. 
0P0R0RNIS (Sylvicolidae. — 07copa aestas, opviç avis) Baird, Birds N America 
1858. 246. = Sylvicola Swains. 
Bill sylvicoline, rather compressed; distinctly notched at tip; rictal bristles 
very much reduced. Wings elongated, pointed, much longer than the tail; the 
first quill nearly or quite the longest. Tail very slightly rounded, tail feathers 
acuminate, pointed; the under coverts reaching to within less than half an inch 
of their tip. Tarsi elongated, longer than the head; claws large, the hinder one 
as long as its digit and longer than the lateral toes. Above olive green, beneath 
yellow; tail and wings immaculate. Legs yellow. 
agilis Baird, Birds NAmerica 246. = Sylvicola agilis Jard. 
formosus Baird, Birds NAmerica 247. = Sylvicola formosa Jard. 
ORAEGITHUS Cabanis, Journ. Ornith. 1859. Extraheft 114. Tf. 1. = Passer 
pusillus Pall. 
ORBIGNESIUS typus Bonaparte 1854. = Ampelis — ? 
ORCHESTICUS (Pitylinae. — op^arixo«; saltator) Cabanis, Mus. Heine. 1851. 
I. 143. — Schistochlamys Reichb. 
Schnabel verhältnissmässig noch kürzer als in Schistochlamys und seitlich 
nicht zusammengedrückt, sondern bauchig, rundlich, sehr an Pyrrhula erinnernd 
und dem von Stephanophorus sehr ähnlich gebildet. Sonstige Gestalt und Bildung 
sehr ähnlich der Gattung Saltator. 
Abeillei Reinhardt, Vidensk. Meddel. 1870. 416. = Schistochlamys occipitalis. 
ater Reinhardt, Vidensk. Meddel. 1870. 416. == Schistochlamys melanopis 
BURM. 
capistratus Reinhardt, Vidensk. Meddel. 1870. 416. == Schistochlamys leuco- 
phaea Cab. 
occipitalis Cabanis, Mus. Heine. I. 143. = Schistochlamys occipitalis. 
0RCHILUS (Tyrannidae) Cabanis, v. Tschudi's Fauna 1845. 164.= Euscarthmus 
Pz. Wied. 
Synon.: Orcheilus Reichb. 
Schnabel weniger breit als bei Platyrhynchus , mehr der dreieckigen Form 
sich nähernd. 
aurigularis Cabanis, Mus. Heine. II. 51. = Euscarthmus auricularis. 
cinereicollis Cabanis, v. Tschudi Fauna peruan. 164. = Euscarthmus auri- 
cularis. I 
ecaudatus Sclater, Nomencl. Av. neotrop. 45. = Todirostrum ecaudatum d'Orb. 
pileatus Cabanis, Wiegm. Archiv 1847. XIII. = Euscarthmus pileatus Cab. 
rufipes Cabanis, Wiegm. Archiv 1847. XIII. — Euscarthmus rufipes Tschud. 
0REAS azurea Temminck, PI. color. 274. texte. = Myiagra coerulea Blyth. 
0REAS Agassiz, Nomencl. Ind. = Oreias Kaup. 
OREIAS Kaup, Entwickig. 1829. — Bonaparte, Compt. rend. 1856. XLII. 880. 
== Tetrao albus, T. scoticus. 
OREICOCA Bonaparte. = Oreicola Bonap. 
