58 BIRDS. 



often very difficult. Many of the Warblers are pleasing 

 songsters, but none exhibit any remarkable powers in 

 that line. All are insectivorous and migratory. 



This family consists of more than a hundred species, 

 chiefly North American, and embraces quite a wide 

 variety, so that the group can perhaps be only distin- 

 guished negatively. The SylvicolidoB grade perfectly 

 into the Tanagridce and Ccerebidce, and probably the 

 three families, and perhaps the Fringillidce^ also, should 

 be merged into one. Our species are divisible into 

 three very distinct sub - families, indicated below. 



I. Bill slender, not hooked, as high as wide at base, with short 

 bristles not reaching much beyond nostrils, or none ; wings 

 longer than tail (except Geothlypis) ; length 6i or less. True 

 Warblers. (SYLVICOLIN^E.) 



* Tail feathers, some or all of them, blotched with white. 

 f Rictus with evident bristles. 



Tarsus shorter than middle toe and claw; entirely black 

 and white, streaked. . . . MNIOTILTA, 1. 



\\ Tarsus not shorter than middle toe and claw. 



a. Hind toe decidedly longer than its claw; bill acute, 

 scarcely notched ; bluish, throat and middle of back 

 with yellow. . . . . . CHLORIS, 2. 



aa. Bill very acute, notched, perceptibly decurved, so 



that the gonys is slightly concave ; rump and under 



parts chiefly yellow. . . PERISSOGLOSSA, 6. 



aaa. Warblers without above characters. DENDKCECA, 7. 



ft Rictus without evident bristles. 



b. Whole head and neck bright yellow; bill notched, half 

 inch or more long. . . . PROTONOTARIA, 3. 



6&. Whole head and neck not yellow; bill acute, not 

 notched nor bristled, less than half inch long. 



HELMINTHOPHAGA, 5. 



**Tail feathers yellow on inner webs; outer webs dusky; 

 plumage chiefly yellow. , , . DENDKCECA, 7, 



