36 Proceedings of the Biological Society of Washington. 



I, 1887, 117 (Costa Rica).— Bangs, Proc. New England Zool. Club, 



II, 1900, 22 (Loma del Leon [Lion Hill], Panama). — Todd, Ann. Carne- 

 gie Mus., VIII, 1912, 208, in text (crit.). — Brabourne and Chubb, 

 Birds S. Am., I, 1912, 296 (ref. orig. descr.; range). 



Myiobius atricauda Gray, Hand-List Birds, I, 1869, 359 (in list of species; 

 range). — Sharpe, Hand-List Birds, III, 1901, 131 (range). — Thater 

 and Bangs, Bull. Mus. Comp. Zool., XLVI, 1906, 219 (savanna of 

 Panama). — von Berlepsch, Ornis, XIV, 1907, 481, in text (crit.). 



[Myiobius barbatus] a. subsp. atricauda Sclater, Cat. Birds Brit. Mus., 

 XIV, 1888, 200, part (localities and references for Panama, Colombia, 

 and Ecuador; crit.). 



Myiobius barbatus atricaudus von Berlepsch and Hartert, Nov. Zool., 

 IX, 1902, 49, part (Costa Rica; crit.). — Hellmayr, Abhand. K. Bayer- 

 ischen Akad. Wiss., II Kl., XXII, 1906, 642 (Paraiso, Panama; S. 

 Javier and Pambilar, Ecuador; diag.; meas.; range). — Ridgway, Bull. 

 U. S. Nat. Mus., No. 50, IV, 1907, 487 (diag.), 488, excl. extralimital 

 localities and references part (descr.; range; meas.; references). — Carri- 

 KER, Ann. Carnegie Mus., VI, 1910, 708 (Costa Rican localities and 

 references; habits). — Hellmayr, Proc. Zool. Soc. London, 1911, 1135, 

 1136 (range; crit.).— Chapman, Bull. Am. Mus. Nat. Hist., XXXVI, 

 1917, 465 (Dabeiba, Caldas, Barbacoas, Rio Frio, and Malena, Colombia; 

 range). — Stone, Proc. Acad. Nat. Sci. Philadelphia, 1918, 267 (Gatun, 

 Panama; nesting). 



Myiobius barbatus var. atricauda Dubois, Syn. Avium, I, 1902, 245 (ref. 

 orig. descr.; range). 



Myiobius barbatus atricauda Bangs, Auk, XIV, 1907, 302 (Boruca and 

 Pozo del Rio Grande, Costa Rica). 



Description. — Above between olive green and dark citrine, the pileum 

 slightly darker, and with a partially concealed vertical spot of lemon 

 chrome; rump Martins yellow; wings dusky, with outer margins of olive 

 green and pale grayish inner margins below; upper tail-coverts and tail 

 black; under surface barium yellow, the throat, breast, sides, tibiae, and 

 crissum more or less strongly shaded with old gold or honey yellow; "iris 

 brown, feet leaden blue; bill black, flesh-colored below. " (Female with the 

 yellow vertical spot restricted or wanting). 



Measurements.— Male: wing, 56-62 (59); tail, 55-60 (58.5); bill, 9.5-11 

 (10.3); tarsus, 16.5-18 (17.5). Female: wing, 52-57 (55); tail, 53-59 

 (56); bUl, 9.5-10 (9.6); tarsus, 14.5-17 (16). 



Range. — Western Costa Rica (Gulf of Nicoya) southward through 

 Panama and through western Colombia and Ecuador to northwestern 

 Peru. 



Remarks. — The proper status of the present bird has been the subject 

 for considerable discussion in the past. Described by Lawrence in 1863 

 from Panama specimens, it was soon discovered to be the same form as had 

 already been recorded as barbatus from western Ecuador. With a restric- 

 ted representation of both forms before them, Salvin and Godman in 1889 

 could find "no material difference" between birds from Panama and those 



