BIRDS OF NORTH AND MIDDLE AMERICA. 117 



Genus ANODORHYNCHUS Spix. 



Anodorhynchus Spix, Av. Bras., i, 1824, 47. (Type, Psittaeus hyaeinthinus 



Latham.) 

 Aodorkynehus (typographical error) Spix, Av. Bras., i, 1824, in index. 

 Awdorhynchos (emendation) Bhehm, Mon. Papag., Heft ii, 1843, 5. 

 Anodontorhynchus (emendation) Agassiz, Nom. Zool. Index Univ., 1846, 24. 

 Anodorynchus (emendation) Lichtenstein, Nom. Av. Mus. Berol., 1854, 73. 

 Anadorhynchus (emendation) Finsch, Die Papag., i, 1867, 387. 

 Anoplorhynchus (emendation) Stjndevall, Met. Nat. Av. Disp. Tent., 1872, 70. 



Very large, long-tailed Psittacidae (length about 750 mm.) of 

 wholly blue or bluish coloration, exposed nostrils, completely 

 feathered lores, and with chisel-like tip of mandible extremely 

 broad (its width equal to more than half the length of gonys). 



Bill enormously large and strong, its depth at base at least nearly 

 equal to length of culm en (sometimes greater), and nearly twice its 

 greatest width; culmen nearly equal to (sometimes greater than) 

 length of head from nostril, regularly and very strongly decurved, 

 broadly rounded; maxilla compressed laterally toward culmen, the 

 hooked tip (unguis) very long, compressed, acute (though broader 

 and flattened transversely), the length of its transversely corrugated 

 palatal surface nearly (sometimes quite) equal to depth of maxilla 

 at base; maxillary tomium not distinctly if at all incised sub- 

 terminally, but with slight sinuations; mandible exceedingly broad 

 (much wider than maxilla), its greatest width nearly to quite equal 

 to length of gonys, broadly rounded beneath, its lower basal outline 

 nearly straight or even slightly convex, its chisel-like tip extremely 

 broad (its width equal to more than half the length of gonys), slightly 

 concave medially, more or less convex or rounded laterally; mandib- 

 ular tomium with a more or less distinct subterminal notch. Wing 

 rather long and pointed, the longest primaries exceeding distal 

 secondaries by about two-fifths the length of wing, or more; eighth 

 or ninth primary longest, the tenth (outermost) longer than sixth 

 (sometimes longer than seventh). Tail as long as wing, graduated 

 for more than half its length, the rectrices tapering terminally but 

 rounded at tip. Tarsus not longer (sometimes decidedly shorter) 

 than outer hind toe without claw. 



Plumage and coloration. — Head normally feathered except orbital 

 region and around base of mandible, where the skin is completely 

 naked; cere naked in front of nostrils and at base of culmen (some- 

 times with short feathers or bristles in front of nostrils), the nostrils 

 exposed. Color wholly bluish (ranging from violet-blue or ultra- 

 marine, the head, neck, and under parts lighter, more cobalt blue to 

 decidedly greenish blue, with head, neck, and under parts much 



