904 Annals of the Carnegie Museum. 



plumage, also some illustrating the postjuvenal moult. A specimen 

 from Boruca, July 16, shows the moult beginning, while another from 

 Carrillo, Oct. 12, still shows traces of the juvenal dress. The moult in- 

 volves only the body plumage and wing-coverts." (W. E. C. Todd.) 



Very abundant over the whole Caribbean slope and Pacific lowlands, 

 although in smaller numbers in the latter region. It extends regularly up 

 to 2,000 feet and stragglers are occasionally taken up as high as 3,000 feet. 

 The bird is to be found wherever there are open fields, pastures, or natural 

 grass belts, such as are along the larger streams. It seldom or never 

 enters the forest. I found the birds breeding abundantly about Guapiles, 

 where fresh eggs were first observed about May 16 and from that time 

 on until July 16. The favorite nesting place in that locality seemed to be 

 a large clump of grass in a pasture, the dome-shaped nest being placed 

 in the centre of the clump, about two feet from the ground. The nests 

 are built of grass blades and a few roots, lined with the same material, 

 and average about seven inches in height by four and one-half in diameter 

 at the bottom. The eggs are dull white, unmarked. Average measure- 

 ments: 24.5 X 18.5 mm. 



740. Arremonops superciliosus superciliosus (Salvin). 



Embernagra superciliosa Salvin, Proc. Zool. Soc. Lond., 1864, 582 (Bebedero, 

 Gulf of Nicoya, W. Costa Rica; coll. Salvin and Godman). — Lawrence, 

 Ann. Lye. N. Y., IX, 1868, 103 ("Nicoya [Enrique Arce]")- — Frantzius, 

 Jour, fur Orn., 1869, 301 (Costa Rica). — Nutting and Ridgway, Proc. U. S. 

 Nat. Mus., V, 1882, 391 (La Palma, Nicoya). — Zeledon, Cat. Aves de C. R., 

 1882, 9; An. Mus. Nac. de C. R., I, 1887, 112. — Salvin and Godman, Biol. 

 Centr.-Am., Aves, I, 1886, 412, part (Nicoya [Arce, Frantzius]). — Sharpe, 

 Cat. Birds Brit. Mus., XII, 1888, 761, part (C. R. [J. Carmiol], Bebedero de 

 Nicoya [Arce]). — Underwood, Ibis, 1896, 436 (Miravalles, Bebedero, Ba- 

 gaces.) 



[Embernagra] superciliosa Sclater and Salvin, Nom. Av. Neotr., 1873, 33. 



Arremonops superciliosus superciliosus Ridgway, Birds North and Mid. Amer., I, 

 1901, 449, 673 (western Costa Rica (Bebedero and La Palma, Gulf of Nicoya). 

 — Bangs, Auk, XXIV, 1907, 310 (Barranca de Puntarenas [Underwood]). 



U. S. Nat. Museum: Santo Domingo de San Mateo (Ridgway), Coyolar 



(Alfaro). 

 Bangs Collection: Bolson, Coralillo, Miravalles (Underwood). 

 Carnegie Museum: Bebedero, Miravalles, Esparta (Carriker). Eleven 



skins. 



Found only in the northwestern portion of Costa Rica, from Santo 



