154 BARTRAM'S VIREO. 



There is a greater difference as to colour between th& sexes of this species 

 than between those of the Red-eyed. The female is generally much less 

 pure in its tints, while the males have usually much more of a yellow- 

 ish tint on their upper and under plumage than is observed in the same sex 

 of the other species. 



Vireo Bartramii, Swains., Bartram's Greenlet, Swains, and Rich. F. Bor. Amer., 



vol. ii. p. 235. 

 Bartram's Vireo, Vireo Bartramii, Aud. Orn. Biog., vol. v. p. 296. 



Adult Male. 



Bill of moderate length, strong, rather broader than high at the base, 

 compressed toward the end; upper mandible with the dorsal line descending 

 and slightly convex, the tip very narrow, acute, decimate, the ridge very 

 narrow, the sides a little convex, the edges sharp, overlapping, with a slight 

 notch close to the tip; lower mandible with the angle of moderate length 

 and rather narrowed, the dorsal line ascending and slightly convex, the back 

 narrow, the sides convex, the edges inclinate, the tip acute and ascending. 

 Nostrils basal, oblong, operculate. 



Head rather large, ovate; neck short; body rather stout. Feet of ordinary 

 length; tarsus compressed, with seven anterior broad scutella, edged behind; 

 toes slender, the first strong, the second much shorter than the fourth; claws 

 rather stout, much curved, compressed, laterally grooved, acute. 



Plumage soft and blended. Wings of moderate length, the first quill a 

 twelfth and a half shorter than the fifth, three-twelfths shorter than the 

 second, which is equal to the third, and exceeds the fourth only by a quarter 

 of a twelfth. Tail rather long, nearly even, the lateral and middle feathers 

 equal, and one-twelfth shorter than the longest. 



Bill brown above, pale bluish-grey beneath. Feet bluish-grey. The 

 general colour of the plumage above is light yellowish-olive, the crown *>f 

 the head deep grey, bordered on each side by a line of blackish, below which 

 is a line of yellowish-white passing from the nostril over the eye, the loral 

 space dusky. Quills brown, yellowish-olive on the outer margin, whitish 

 on the inner. Tail wood-brown, margined with paler. The lower parts are 

 white, the breast tinged with pale yellow, the throat and sides with grey. 



Length to end of tail 4^ inches; extent of wings 7f ; bill along the ridge 

 T 6 2, along the edge of lower mandible f|; wing from flexure 2^; tail 2yJ; 

 tarsus T 8 2; hind toe T 3 2 -, its claw f|; middle toe -f|, its claw ff . 



This species is almost exactly similar to Vireo olivaceas in colour, but is 

 considerably smaller, and differs in having the wings shorter, with the first 

 quill considerably shorter than the fifth, whereas in that species it is always 

 much longer, generally exceeding even the fourth. 



