330 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



e. Feathers of head peculiar, consisting (except basally) of the broadly- 

 expanded horny shaft, those of pileum curled, resembling shavings of 

 glossy black horn ; throat yellowish white passing into yellow on f oreneck, 



speckled with black Bauharnaisius (extraliniital).a 



ee. Feathers of head normal; throat uniform black or dark chestnut. 



Pteroglossus (p. 340). 



cc. Tail not longer (usually shorter) than wing; auricular feathers elongated, 



yellow, contrasting with the uniform black or chestnut of rest of head; 



breast black, tawny, or gray (Uke foreneck and throat); adult males with a 



flank patch of yellow or orange elongated feathers Selenidera (p. 348). 



hh. Bill compressed laterally, the cuhnen broadly rounded (sometimes flattened 

 basally); sides of maxilla more or less concave, sometimes ridged and 

 grooved ; general color green Aulacorhynchus (p., 351). 



Genus RAMPHASTOS Linnaeus. 



Ramphastos Linn^us, Syst. Nat., ed. 10, i, 1758, 103; ed. 12, i, 1766, 150. (Type, 



R. tucanus Linnseus.) 

 Rhamphastos (emendation) Daudin, Traits El^m. Compl. Orn., i, Jan., 1800, 376, 



422. 

 Tucaius Bonaparte, Ateneo Italiano, ii, 1854, 119 (Consp. Vol. Zygod., 1854, 4). 



(Type, Ramphastos dicolorus Linnaeus.) 

 Tucajus (emendation) Cassin, Proc. Ac. Nat. Sci. Phila., 1867, 105. 

 Burhynchus Cassin, Proc. Ac. Nat. Sci. Phila., 1867, 102. (Type, Ramphastos 



carinatus Swainson=i?. piscivorus Linnaeus.) 

 Tucanus Cassin, Proc. Ac. Nat. Sci. Phila., 1867, 104. (Type, Ramphastos 



erythrorhynchus GmeUn=J?. tucanus Linnaeus.) 

 Ramphodryas Cassin, Proc. Ac. Nat. Sci. Phila., 1867, 106. (Type, Ramphastos 



aneZ Vigors.) 

 Dinorhamphusf> Heine, in Heine and Reichenow, Nom. Mus. Hein. Orn., 1890, 



228. (New name for Tucanus Cassin, on grounds of purism!) 



Bill enormously developed (more than twice as long as head, some- 

 times four times as long as head and nearly as long as wing), more than 

 twice as long as deep, the width at base much less than its depth at 

 same point; culmen curved from base (the middle portion sometimes 

 nearly straight), strongly decurved terminally, broadly rounded, flat- 

 tened, or distinctly ridged (carinate); maxillary tomium strongly 

 concave throughout or nearly straight for most of its length, then 

 strongly concave terminally, the mandibular tomium correspondingly 

 convex, both more or less strongly serrate; gonys more than twice to 

 more than five times as long as mandibular rami, more or less prom- 

 inent basally, not ridged, nearly straight for most of its length but 



a Bauharnaisius Bonaparte, Consp. Av., i, 1850, 95. (Type, Pteroglossus beau- 

 harnaisi Wagler.) Beauharnasius Bonaparte, Ateneo Italiano, ii, 1854, 119 (Consp. 

 Volucr. Zygod., 1854, 4). (Type, Pteroglossus beauharnaisi Wagler.) — Ulocomus Heine, 

 in Heine and Reichenow, Nom. Mus. Hein. Orn., 1890, 229. (To replace Bauharnai- 

 sius Bonaparte, on grounds of purism!) 



Upper Amazon Valley. (Monotypic.) 



bJsivdc, mighty; pafi^og, beak (Richmond). 



