498 BULLETIN 50, UNITED STATES NATIONAL MUSEUM, 



KEY TO THE SPECIES AND SUBSPECIES OF MITREPHANES. 



a. Anal regi(Hi and lower alxJomcn bnff (more or less deep) ; back, etc., olive-brownish. 

 {Mitrephanes phseocercus.) 

 b. Smaller, with relatively shorter bill (male averaging wing 71.4, exposed culmen 

 9.6, female wing 68.4, exposed culmen 9.2); coloration darker, the pileum sepia 

 brown, back brownish olive, breast, etc., nifous-cinnamon or russet. (South- 

 eastern Mexico.) Mitrephanes phaeocercus phaeocercus (p. 498) 



bb. Larger, with relatively longer bill (male averaging wing 74.1, exposed culmen 

 10.5, female wing 70.5, exposed culmen 10.1); coloration paler, the pileum 

 light olive-brown, back light buffy olive-brown; breast, etc., dull tawny- 

 ochraceous or clay color. (Northwestern Mexico.) 



Mitrephanes phaeocercus tenuirostris (p. 500) 



aa. Anal region and lower abdomen light yellow; back, etc., greenish olive. (Costa 



Rica; Panama) Mitrephanes aurantiiventris (p. 501) 



MITREPHANES PHiEOCERCUS PHAEOCERCUS (Sclater). 

 DUSKY-TAILED FLYCATCHER. 



Adults (sexes alike). — Pileum deep olive-brown, bister, or sepia, the 

 feathers of crest sometimes with indistinct darker shaft-streaks; 

 hindneck, back, scapulars, lesser win^-coverts, rump, and upper tail- 

 coverts plain, lighter, less brownish, olive; tail deep to dark grayish 

 brown, the outer webs of rectrices passing into lighter grayish brown 

 on edges; \vings (except lesser coverts) dusky, the middle and greater 

 coverts tipped with cinnamon or cinnamon-buffy (forming tw^o dis- 

 tinct bands), the secondaries edged (except basally) w^ith pale cinna- 

 mon-buffy or dull whitish, the primaries narrowly and indistinctly 

 edged with light grayish brown or olive; lores dull brownish white or 

 pale cinnamomeous, suffused or clouded w^th dusky; a narrow and 

 usually indistinct orbital ring of buffy whitish or pale cinnamon-buffy; 

 rest of side of head, sides of neck, and under parts plain tawny-ochra- 

 ceous or russet, deepest on chest and sides of head and neck, paler 

 (sometimes didl whitish) on chin, and fading on flanks, lower abdo- 

 men, and under tail-coverts into deep buff or clay color; axillars and 

 lining of wing ochraceous-buff or tawny-buff; inner webs of remiges 

 edged with pale vinaceous-buft" ; maxilla dark brown or blackish, 

 mandible pale (yellowish in life?); iris brown; legs and feet brownish 

 black. 



Adult male.— Ijengih (skins), 122-125 (123); wing, 69.5-73 (71.4); 

 tail, 60-63.5 (61.7) ; exposed culmen, 9-10 (9.6) ; tarsus, 12-13.5 (12.6) ; 

 middle toe, 6.5-7 (6.8). « 



« Five specimens from southern Mexico. 



