OU 
EUCORYSTES. 43 
Section V. OSCINES CULTRIROSTRES. 
Fam. ICTERIDA *. 
Subfam. I. CASSICINZL. 
Nares, nude, apertz, aut operculo corneo obtecte; mesorhinium plus minusve dilatatum, clypeum frontalem 
formans. 
A. Nares aperte haud operculate. 
a. Clypeus frontalis multo dilatatus ad basin incrassatus. 
EUCORYSTES. 
Eucorystes, Sclater, Ibis, 1883, p. 147; Cat. B. Brit. Mus. xi. p. 311. 
The single species contained in this genus was until lately placed in Ocyalus, the 
type and now the only species of which is 0. latirostris of the valley of the Upper 
Amazons. In 1883 Mr. Sclater separated O. wagleri from Ocyalus and placed it under 
a new generic name, Hucorystes, on account of the greater development of the frontal 
shield, its extension backwards to a line between the middle of the eyes, its incurved 
culmen, nuchal crest, and shorter wings. 
The bill of Eucorystes wagleri is elongated and acute, the culmen slightly decurved, 
the edges of the maxilla looked at from above are concave, the frontal shield is much 
expanded at the base, its proximal margin nearly semicircular and thickened so as to 
form a fold over the forehead ; this swollen plate is continued forwards so as to form a 
sort of ridge overhanging the nostrils, which are oval, without any surrounding mem- 
brane, and directed forwards; the mandible is swollen towards the base, the lower 
angle of the sheath reaching backwards as far as the proximal edge of the frontal 
shield ; the legs are stout and of insessorial structure, the tarsi being short ; the wings 
long (though shorter than in Ocyalus latirostris), the fourth primary is the longest, the 
third being slightly shorter, the second is longer than the fifth, which again is longer 
than the first ; all the outer primaries are acute though rounded at their tips, the secon- 
daries are broad but short and graduated; the tail-feathers are narrow and bluntly 
pointed, the central feathers are a little longer than the outer pair, the third on either 
side from the centre are the longest pair; the tail is thus somewhat cuneate, but 
furcate centrally. 
The range of Eucorystes is given under its only species £. waglert. 
* This family has very recently been thoroughly revised by Mr. Sclater in the eleventh volume of the 
British Museum Catalogue of Birds, in compiling which the author had the whole of our series of specimens 
for examination and for incorporation into the National Collection. This catalogue therefore contains a com- 
plete list of our specimens up to its issue (April 1886). In preparing our account of the Mexican and Central- 
American species of Icteride, we have found this work of the greatest service, and we have followed the 
classification there adopted throughout with very slight modification. 
50* 
