BIRDS OP NORTH AND MIDDLE AMERICA. 549 



ff. Above olive; under wing-coverts pale yellow. 



q. Above clear olive; under parts paler, the clu^st not extensively nor 

 conspicuously olive. (Bolivia. ) 



Empidoiiax bolivianus (^cxtraliniilul)" 

 gg. Al)ove dark olive; under i)arts darker, the chest extensively and 

 conspicuously olive. { Trinidad. ) 



Empidonax lawrencei i cxtraliniital )'^ 

 cc. Under tail-coverts Ijuffy. 



d. Chest pale grayish brown, in contrast with dull grayish white of throat : gray- 

 ish brown of upper parts darker. (Southern Mexico to Costa Rica.) 



Empidonax albigularis (p. 584) 

 dd. Chest pale grayish buffy, scarcely different from the paler huffy of throat; 

 grayish brown of upper parts paler. (Western Mexico.) 



Empidonax timidus (p. 586) 

 hh. Pileum and hindneck black or sooty, in contrast with olive or olive-brown of 



back, etc. (Costa Rica and Panama.) Empidonax atriceps (p. 586) 



0/ . Under parts ochraceous-buffy. {Empidonax fulvifrons.) 

 h. Pileum buffy brownish, concolor with l)ack. 



c. Larger (wing 68, tail 57). (Northeastern Mexico.) 



Empidonax fulvifrons fulvifrons (p. 588) 

 cc. Smaller (wing not more than 65, usually much less; tail less than 55). 



d. Paler, with upper parts grayer, under parts more buffy. (Southern Arizona 

 and southwestern New Mexico to northern Sinaloa, Jalisco, and Durango.) 



Empidonax fulvifrons pygmseus (p. 589) 

 ddj Darker, with upper parts browner, under parts more ochraceous. (Central 

 and southern Mexico; Guatemala?) 



Empidonax fulvifrons rubicundus (p. 591) 

 hh. Pileum and hindneck dusky sooty gray or grayish sepia, in contrast with olive- 

 brown of back. (State of Chiapas, southern Mexico; Guatemala?) 



Empidonax fulvifrons fusciceps ( p. 592) 



EMPIDONAX FLAVIVENTRIS (Baird). 

 YELLOW-BELLIED FLYCATCHER. 



Adults {sexes alike) S — Above plain greenish olive or dull olive- 

 green, the feathers of pileum slightly darker centrally or mesially; 

 tail deep grayish brown, with outer webs of rectrices passing into 

 greenish olive on edges; wings dull black, the middle and greater 

 coverts broadly tipped with pale olive-yellow or dull primrose 

 yellow, the secondaries edged (except basally) with the same, the 



^Empidonax boliiiamis Allen, Bull. Am. Mus. N. H., ii, Mar., 1889, 86 (Yungas?, 

 Bolivia; coll. Am. Mus. Nat. Hist.). — [E7npidonax] bolivianus Sharpe, Hand-list, iii, 

 1901, 138. 



bMyiohius flaviventris (not Tyrannnla flaviventns Baird) L^otaud, Ois. Trinidad, 

 1866, 229 (Trinidad). — Ochthceca flaviventris Lawrence, Ann. N. Y. Acad. Sci., iv, 

 June, 1887, 67 ("South America;" coll. G. N. Lawrence). — Empidona.r laivrcncei Allen, 

 Bull. Am. Mus. N. H., ii, June 28, 1889, 150 (crit.; new name for Ochthceca flavivc7itris 

 Lawrence) Chapman, Bull. Am. Mus. N. H., vi, 1894, 42 (Trinidad; [notes; crit.); 

 Hellma>T, Novit. Zool., xiii, 1906, 25 (Caparo, Trinidad; crit.). — lEmpidonax] law- 

 rencei Sharpe, Hand-list, iii, 1901, 138. 



c I am unable to distinguish any constant seasonal difference in coloration in this 

 species. 



