458 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Range. — Highlands Costa Rica to western Ecuador. (Two species.) 

 The species which I have felt compelled to make the type of a new 

 genus has always been placed in Buarrciiion^ but eA^dentlj^ has nothing- 

 to do with the birds which properly constitute that genus. In st3de 

 of coloration it somewhat resemldes some of the species of Atlcqyetes^ 

 especialh' those with chestnut pihnnu and yellow lielly, which, also, 

 were formerly placed in Buarroiion; but in structural characters it 

 comes far nearer to A/Temon, from which its very different style of 

 coloration, more rounded wing, relatively longer middle toe, and dif- 

 ferently shaped and partially decomposed rectrices serve to readily 

 distinguish it. 



Zi/.-^urus castaneicej)s (Schdtev) resembles Z. crassirostrls in coloration, 

 except that the under parts, posterior to the throat, are wholly olive- 

 green and there are no white markings on the head. It is quite 

 identical structurally also, and there can be no question that the two 

 species are strictly congeneric. It belongs to eastern Ecuador and 

 Colombia (province of Antioquia). 



KEY TO THE SPECIES OF LYSURUS. 



a. Abdomen yello\v; a white malar stripe, flecked with dusky. (Costa Rica and 



Veragua. ) Lysurus crassirostrls (p. 458 ) 



o«. Alxlomen olive-green like rest of under parts; no white malar stripe. (Colombia 

 and eastern Ecuador. ) Lysurus castaneiceps (extralimital).^ 



LYSURUS CRASSIROSTRIS (Cassin). 

 BARRANCA SPARROW. 



Adults {sexes aJih^). — General color deep olive-green; pileum and 

 hindneck chestnut; lower breast and abdomen lemon j^ellow; sides of 

 head, chin, and throat grayish dusky or l)lackish, relieved b}- a malar 

 stripe of white, ffecked with dusky, the chin (sometimes upper throat 

 also) with some admixture of white; maxilla blackish, paler along 

 tomium; mandible pale brownish (in dried skins); legs and feet dark 

 brownish. 



Adidt male.— Length (skins), 142.2J-161.29 (1.51.64); wing, 71.12- 

 80.01 (75.44); tail, 59.69-68.58 (64.01); exposed culmen, 13.21-14.73 

 (13.97); depth of bill at base, 8.38-9.65 (8.89); tarsus, 27.94-29.21 

 (28.45); middle toe. 18.51-20.32 (19.30).' 



Highlands of Costa Rica (Barranca, Buena Vista, Rio Sucio, etc.) 

 and Veragua (Cordillera de Tole, Cordillera del Chucu, Santiago, 

 Cascajal-Cocle, etc.). 



Buarremoricrassi}-ostrisC.\.ssi:s, Proo. Ac. Nat. Sci. Phila., Aug., 1865, 170(Barranca, 

 Costa Rica; U.S. Nat. Mus.) .— Salvix, Proc. Zool. Soc. Lond.,1867, 140, pi. 

 14 (Cordillera de Tole, Santiago, and Cordillera del Chucu, Veragua); 1870, 



^ Buarremon castaneiceps Sclater, Proc. Zool. Soc. Lond., 1859, 441 (Rio Napo, 

 e. Ecuador; coll. P. L. Sclater). 

 ^Two specimens. 



