WHITE-THROATED WARBLER. 351 



the species of the genus. The bill is short, about the same 

 breadth and depth at the base, beyond the middle compressed ; 

 the upper mandible has its dorsal outline at first straight and 

 slightly declinate, towards the end convexo-declinate, the sides 

 convex, the edges sharp, slightly inclinate, and overlapping, 

 the tip narrow and sharpish with an obsolete sinus on each 

 side ; the lower mandible with the dorsal outline nearly straight 

 and ascending, the sides erect but a little convex, the edges 

 sharp and slightly inclinate ; the gape-line nearly straight. 

 Both mandibles are concave within, the upper with a slight 

 prominent median line. The palate is flat ; the aperture of the 

 glottis oblongo-linear, edged with papillae. The tongue emar- 

 ginate and serrulate at the base, with a large conical papilla 

 at each angle, tapering, nearly flat above, its edges thin, the 

 point narrow, slit, and minutely lacerate ; its length four- 

 twelfths and a half. The aperture of the glottis is margined 

 behind with large pointed papillae, of which there are also 

 many behind. The oesophagus is two inches and a quarter 

 long, without crop or dilatation, its average diameter two- 

 twelfths and a quarter ; the stomach is eight and a half twelfths 

 long, oblong, compressed, its lateral muscles large, the lower 

 extremely thin ; the tendons moderate, the inner coat very thin. 

 The intestine is six inches and three quarters in length, its 

 diameter diminishing from two and a half twelfths to one and 

 a half ; the coeca oblong, one-twelfth long, and an inch distant 

 from the extremity. 



The aperture of the eyes is two-twelfths in diameter. The 

 nostrils elliptical, one-twelfth long. The ear circular, two- 

 twelfths and three-fourths. The feet are slender, the tarsi com- 

 pressed, with eight distinct anterior scales ; the first toe with 

 eight, the second with eight, the third with eleven, the fourth 

 with ten scales. The claws are extremely slender, compressed, 

 laterally grooved, moderately arched, rather long, and very 

 acute. 



The plumage is very soft and blended. All the feathers at 

 the base of the bill are bristle-tipped ; the bristle-feathers at 

 the base of the upper mandible so small as scarcely to be dis- 

 tinguishable. The wings are of moderate length, broad, semi- 



