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FAMILY XI. SYLVIANiE. WARBLERS. 
Rill of moderate length, slender, straight, a little broader than high at the 
base, compressed toward the end ; upper mandible with its dorsal line straight 
and decimate, convex at the end, the tip small, acute, the notches small ; 
lower mandible with the angle of moderate length and narrow, the dorsal 
line straight, the sides convex, the tip narrow. Nostrils basal, oval or 
oblong. Head rather large, ovate ; neck short ; body rather slender. Feet 
of ordinary length, slender ; tarsus compressed, with seven anterior scutella ; 
toes moderate, compressed ; first stouter, second and fourth nearly equal, 
third much longer, and adherent at the base ; claws moderate, arched, slender, 
compressed, acute. Plumage soft and blended. Bristles short or weak. 
Wings of moderate length or long ; the first quill very small, the second, 
third, and fourth longest. Tail long or of moderate length, of twelve 
feathers. Tongue, sagittate,- slender, tapering to a slit and lacerated point. 
(Esophagus rather narrow, without crop ; proventriculus oblong ; stomach 
a gizzard of moderate strength, with the muscles distinct, the epithelium 
dense and rugous ; intestine of moderate length ; cceca very small. Trachsea 
simple, with four pairs of inferior laryngeal muscles. 
Of this family, which in Europe is so numerous, there are in North 
America only two genera, Regulus and Sialia, the former composed of very 
small birds, allied in manners to the Tits, the latter approaching the 
Thrushes in form. The connecting links being wanting with us, these 
genera might seem at first sight very dissimilar. 
Genus I.— REGULUS, Cuv. KINGLET. 
Bill short, straight, very slender, a little broader than high at the base, 
compressed toward the end ; upper mandible nearly straight in its dorsal 
outline, the edges slightly notched, the tip a little declinate, acute ; lower 
mandible with its outline ascending, nearly straight, the tip acute. Nostrils 
basal, elliptical, concealed by the revei’sed feathers. Head large, broadly 
ovate ; neck short ; body short. Legs rather long ; tarsus slender, longer 
than the middle toe, much compressed, scutella blended, excepting the lower 
four toes, rather small, much compressed, hind toe large ; lateral equal ; claws 
