28 Nelson— North American Mainland Myiarchtis. 



Inner webs of tail feathers mainly rufous ingtiietus p. 38. 



Inner web of tail feathers mainly dusky yucntunensis p. 41. 



Inner web of outer tail feather usually entirely rufous on basal 



two-thirds, with outer third more or less broadly tipped 



with dusky 



Bill smaller, slenderer; color darker - cinerascens p. 33. 



Bill larger, broader; color paler - - pertinax \>. ^Q. 



Bill flattened with depth at angle of gonys decidedly less than width at 

 same place (subgenus Ony chapter us) 

 Tail feathers usually distinctly edged on one or both webs with rufous 

 or cinnamon 

 Tail feathers distinctly edged on both webs with rufous or cinnamon 

 Crown conspicuously darker than back (black or blackish) 



Crown sooty black ... - nigricupillus p. 44. 



Crown clove brown .... lawrencei_p. 42. 



Crown appreciably darker than back (usually between olive and 



sepia brown) ... - querulus p. 47. 



Tail feathers not at all or but slightly edged on inner webs with 



rufous or cinnamon 



Back greenish or greenish olivaceoiis 



Back greenish, crown intensely black - bangsi p. 45. 



Back greenish olivaceous, crown bistre brown 



platyrhynclius p. 45. 

 Back grayish olivaceous or hair brown 



Back grayish olivaceous; inner webs of tail feathers usually 



not edged with rufous - - oUrascem p. 48. 



Back hair brown; inner webs of tail feathers usually slightly 



edged with rufous - - - tresmarice p. 49. 



Tail feathers not edged on either web with rufous; no rufous edgings 



on wings; crown dull black - - - nigriceps p. 49. 



DESCRIPTIONS OF SPECIES AND SUBSPECIES. 



Genus Myiarchus Cabanis. 



1845. MyiarcJms Cabanis, in Tschudi, Fauna Peruana, Aves, 1845, p. 

 152. Type Muscicapa ferax Gmelin. 



Typical Myiarchus is characterized by a rounded and proportionately 

 deep bill; the depth at angle of the gonys nearly or quite equaling its 

 width at the same place. It includes the majority of the species in 

 this paper, viz., M. ferox panainensis, M. crinitus, M. c. residims, M. mex- 

 icanus, M. m. magister, M. cinerascens. M. c. -pertinax, M, nuttingi, M. n. 

 inquietus, M. brachyurus, and M. yucatanensis. 



