184 Proceedings of the Biological Society of Washington. 



f. Above darker (dark olive); breast less strongly 

 contrasted with abdomen 



Myiarchus sordidus. 



e'. Above darker, more dusky Myiarchus 'phoeonotus. 



d'. Tail relatively longer, averaging more than nine-tenths 

 of the wing; outermost (tenth) primary relatively 

 shorter, conspicuously shorter than fourth; bill 

 stouter and darker colored, 

 e. Outermost pair of rectrices without conspicuous 

 paler external margins {Myiarchus ferox). 

 f. Above darker (dark o]ive) ....Myiarchus ferox ferox. 

 f. Above paler (light olive). 



g. Above moderately pale (dull brownish olive) . 

 h. Pileum more brownish 



Myiarchus ferox swainsoni, 

 h'. Pileum more dusky 



Myiarchus ferox venezuelensis. 

 g'. Above decidedly pale (Saccardo's oUve) 



Myiarchus ferox panamensis. 

 e'. Outermost pair of rectrices with conspicuous paler 



external margins Myiarchus cephalotes. 



c'. Rectrices with conspicuous paler tips.. ..Myiarchus apicalis. 

 h'. Pileum strongly contrasted with the back. 



c. Pileum gray anteriorly, becoming black posteriorly 



Myiarchus phceocephalus. 



c'. Pileum wholly black Myiarchus atriceps. 



a'. Smaller forms; wing of male averaging not more than 81 mm., of 

 female not more than 75.5 mm. {Myiarchus tuherculifer) . 

 b. General coloration duller; upper parts plain olive, the pileum 

 darker, but not strongly contrasted with the back; gray 

 of imder parts deeper (pale neutral gray) 



Myiarchus tuherculifer tricolor, 

 b'. General coloration somewhat brighter; upper parts between 

 deep olive and citrine drab, the pileum dusky black, in 

 contrast with the back; gray of under parts lighter (pallid 



neutral gray) Myiarchus tuherculifer tuhercidifer. 



b". General coloration decidedly brighter; upper parts olive 

 citrine, the pileum deeper black in strong contrast ; anterior 

 under parts pallid neutral gray 



Myiarchus tuhercidifer nigriceps. 



Myiarchus crinitus (Linnaeus). 



(South American references only.) 



Myiarchus crinitus von Berlepsch, Journ. f. Orn., XXXII, 1884, 277, 

 303 (Bucaramanga, Colombia). — Bangs, Proc. Biol. Soc. Washington, 

 XII, 1898, 137 ("Santa Marta," Colombia).— Allen, Bull. Am. Mus. 

 Nat. Hist., XIII, 1900, 142 (Bonda, Colombia).— Allen, Auk, XVII, 

 1900, 364 (Bonda, Colombia; von Berlepsch's and Bangs' records). — 



