BIRDS OF NORTH AND MIDDLE AMERICA. 881 



" Casymorhynchus [emendation] Gkay, 184- " (Gray, Hand-list, i, 18G9, 375.) 

 Arapunga Lesson, Traits d'Orn., 1831, 365. (Type, Ampclis nudicollis YieiWot.) 

 Eulopogon Gloger, Gem. Hand-u. Hilfsb. Nat., 1842, 321. (Type, Ampelis 

 variegata Gmelin.) 



Large Cotingidae (wing about 145-170 mm.) with weak and de- 

 pressed bill, gonys much shorter than the long antl narrow mandibular 

 rami, and commissure twice as long as culmen. 



Bill weak, broad and depressed basally, deeply cleft, the commis- 

 sure extending to beneath eyes; culmen less than two-thirds as long 

 as tarsus, curved nearly from base, the tip of maxilla weakly uncinate; 

 gonys very short (about half as long as the narrow mandibular rami), 

 decidedly convex; commissure very long (twice as long as culmen, or 

 more, the rictus posterior to anterior angle of eye), more or less arched ; 

 both the maxillary and mandibular tomia notched subterminally. 

 Nostril exposed, rather large, oval, in anterior end of nasal fossae. 

 Rictal bristles absent (but a few bristles projecting over loral portion 

 of commissure in females of some species). Wing long and broad, 

 the longest primaries exceeding secondaries by more than length of 

 tarsus; sixth and seventh, or sixth to eighth, primaries longest, the 

 tenth about as long as second or third or intermediate between fourth 

 and fifth. Tail about two-thirds as long as wing, even, slightly 

 rounded, or faintly emarginate, the rectrices moderately broad, with 

 rounded or subacuminate tip. Tarsus much shorter than commis- 

 sure, its scutellation typically pycnaspidean; middle toe, with claw, 

 slightly longer than tarsus, its basal phalanx united for greater part to 

 outer toe, for nearly as much to inner toe; outer toe decidedly shorter 

 than middle one, very little longer than inner toe; hallux decidedly 

 shorter than inner toe, but much stouter, its basal pad (tylarus) broad 

 and flattened, with the conspicuously extruded inner edge continuous 

 with that of inner toe; claws rather short, broad, and compressed. 



Plumage, coloration, and ornaments. — Contour plumage soft, blended; 

 no crest or other elongated feathers about head or neck. Adult males 

 with more or less elongated, usually naked, caruncular appendages to 

 forepart of head, br on tliroat, or else the throat, together with loral, 

 orbital, and malar regions, denuded, the color of the plumage entirely 

 white, white w^th brown head and black wings, or chestnut-rufous 

 with white head and neck. Adult females destitute of appendages or 

 wattles, the plumage plain olive-green above, striped with olive-green 

 and yellowish beneath. 



Nidification. — Unknown. 



Range. — Costa Rica to southeastern Brazil, but apparently absent 

 from Amazon Valley. (Four species.) 



Notwithstanding the great amount of difference between adult 

 males of this group, I am inclined to consider them as constituting a 

 single genus. In every other superspecific group of the family to 

 11422— VOL 4—07 — —56 



