



FIG. i. Helminthophila pimis, male. 



FIG. 2. Helminthophila pinus, female. 



FIG. 3. "Lawrence's Warbler," male; one of the integrading forms. 



FIG. 4. " Brewster's Warbler," male; another of the intergrading forms. 



FIG. 5. Helminthophila chrysoptera, male. 



FIG. 6. Helminthophila chrysoptera, female. 









Warblers of North America. 



