618 Annals of the Carnegie Museum. 



stictoptera), giving very good proof of the fact that these two so-called 

 species were merely male and female of one form ( Icemos tic to) . I had 

 discovered the same thing some time previously, and in 1908 published 

 a note on the same thing without having seen Mr. Hellmayr's paper. 

 There can be no question but that the birds are the same. I have 

 taken then both together and the sexing of all the skins which I have 

 seen gives further proof, if any were needed. 



This species in Costa Rica is confined to the foothills of the Carib- 

 bean slope, between an altitude of 1,000 and 2,500 feet, inhabiting 

 the heavy, dark, humid forests found everywhere in that region. I 

 usually found it along the sides of some dark, damp ravine, on the 

 ground or in the low bushes. It is not a common bird at all, and 

 very few have been taken by collectors. 



353. Myrmeciza immaculata (Lafresnaye). 



Thamnophilus immacnlatus Lafresnaye,, Rev. Zool., 1845, 340 (Colombia). — 



Salvin, Ibis, 1870, 114 (Tucurriqui, Costa Rica [Arce]). — Zeledon, An. 



Mus. Nac. de C. R., I, 1887, 114 (Costa Rica). — Sclater, Cat. Birds Brit. 



Mus., XV, 1890, 189 (Tucurriqui [Arce]). 

 Myrmelastes immacnlatus Salvin and Godman, Biol. Centr.-Am., Aves, II, 



1892, 225 (Costa Rican references). 

 Myrmeciza zeledoni Ridgway, Proc. Biol. Soc. Wash., XXII, 1909, 74 (Guayabo, 



Costa Rica; U. S. Nat. Mus Coll.). 



U. S. Nat. Museum : Guayabo, March, 1908 (Ridgway and Zeledon); 



c? and $. 

 Bangs Collection : Cariblanco de Sarapiqui, c? and ? ; La Hondura, 



9 (Underwood). 

 Fleming Collection: Cariblanco de Sarapiqui (Underwood); one 



specimen. 

 Carnegie Museum : La Hondura (Carriker), three 9's ; Cariblanco de 



Sarapiqui, (Underwood) one cT. 



In a collection of birds recently received from western Colombia by 

 Mr. Bangs, are six skins of Myrmeciza immaculata (Lafresnaye), four 

 females and two Ynales. After the closest comparison with three 

 females and one male of the same species from Costa Rica, I cannot 

 find a single character upon which Mr. Ridgway based his M. ze?edo7ii, 

 which will hold good. Tlie birds are almost exactly alike in colora- 

 tion, with the exception that the Costa Rican females are a very little 

 richer brown on the throat and breast, but it is so small a difference 

 that in some specimens it can scarcely be detected. The black on 



