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FAMILY XX.— YIREONIN^l. GREENLETS. 
Bill of moderate length, straight, rather stout, compressed toward the end ; 
gap-line slightly arched, notches distinct, tip very small, declinate. Head 
rather large, ovate ; neck short; body rather slender. Feet of moderate 
length ; tarsus compressed, slender, with seven anterior scutella ; toes rather 
small, hind toe rather stout, lateral equal. Claws moderate, arched, com- 
pre&eed, acute. Plumage soft and blended. Wings of moderate length, 
rather pointed. Tail of moderate length, even or emarginate. Roof of 
upper mandible concave, with a median ridge ; tongue narrow, flat above, 
with the point slit ; oesophagus of moderate length, without dilatation ; 
stomach roundish, muscular, with a dense rugous epithelium ; intestine short, 
and rather wide ; coeca very small. Trachea simple, with four pairs of 
inferior laryngeal muscles. 
Genus I. — YIREO, Vieill. GREENLET. 
Bill rather short or of moderate length, rather strong, straight, broader 
than high at the base, compressed toward the end ; upper mandible with the 
dorsal line slightly convex, the ridge narrow, the sides sloping and towards 
the end somewhat convex, the edges straight, the notches distinct, the tip 
small, decurved, acute ; lower mandible with the angle of moderate length 
and rather narrow, the dorsal line ascending and rather convex, the sides 
convex, the edges inclinate, the tip acute and ascending. Nostrils basal, 
oblong. Head rather large, ovate ; neck short ; body rather stout. Tarsus 
rather short, slender, compressed, with seven scutella ; toes small, first large, 
inner considerably shorter than outer, which is adnate at thebase. Plumage 
soft and blended ; bristles small. Wings rather long, with the second and 
third quills longest, the first not much shorter. Tail of moderate length, 
nearly even. 
