690 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



tail, 55.5-61 (57.9); exposed culmen, 11-13 (11.8); tarsus, 20-23 (22.3); 

 middle toe, 13-16 (14.1:).' 



Adult /;y//rt/r'.— Length (skins), 122-130 (125.4); wing, 51.6-55 

 (53.6); tail, 54-61 (55.8); exposed culmen, 11-12 (ll.3); tarsus, 21-23 

 (22); middle toe, 13-16 (14.3).' 



Having but a single Guatemalan specimen (the type of Geothlypis poUocephah, 

 var. crminucha) for comparison with the Central American series, I for the present 

 unite all under one name. The single Guatemalan specimen has the gray of the 

 pileum extended over the hindneck, which apparently is not the case with any of 

 the specimens from farther southward, and it has the wing and tail longer; but a 

 series from Guatemala might show that these differences are not constant. 



Central America, from Guatemala (Retalhuleu) to Chiriqui (Volcan 

 de Chiriqui; Boquete). 



Geothhjpis :L(iuino(:tiarts {not MotadUa lequinocticdis Gmelm) Salvin and Sclatee 

 Ibis, 1860, 27o (Duefias, Guatemala). 



Gcolhlfipis 2}oliocephala, part, Baibd, Review Am. Birds, 1865, 225 (Retalhuleu, 

 Guatemala). 



Oeothhtpis polioccphala (not of Baird) Salvin, Ibis, 1870, 114 (Costa Eica).— 

 Sharpe, Cat. Birds Brit. Mus., x, 1885, 359, part, pi. 9, fig. 4 (British Hon- 

 duras; Retalhuleu, San Geronimo, and Dueiias, Guatemala). 



Gmlhliipix polioccphala, var. caninucha Ridgway, Am. Journ. Sci., iv, Dec., 1872, 

 459; in Baird, Brewer, and Ridgway's Hist. N. Am. Birds, i, 1874, 296. 



[Gcotliljipin jmliocephala] (3. caninuclia Ridgway, Am. Journ. Sci., iv., Dec., 1872, 

 459 (Retalhuleu, Guatemala; coll. U. S. Nat. Mus.). 



Geothljipiis polioccphala . . var. canimicha Boucard, Proc. Zool. Soc. Lond., 

 1878, 52 (San Jos6, Costa Rica). 



Gi'ollih/pis caninucha Salvin and Godman, Biol. Centr.-Am., Aves, i, 1881, 153, 

 part, pi. 9, figi 2 (Patio Bolas, etc., Guatemala; Costa Rica).— Zeledon, 

 Proc. U. S. Nat. Mus., viii, 1885, 105 (Costa Rica); Anal. Mus. Nac. Costa 

 Rica, i, 1887, 107 (Los Anonas, Costa Rica) . — Underwood, Ibis, 1896, 434 

 (^'olcan de Miravalles, Costa Rica). 



IGcotlilypix polioccphala'] fi. O. caninucha Sharpe, Cat. Birds Brit. Mus., x, 1885, 

 360, in list of specimens, part (Costa Rica). 



' Fifteen .specimens. 



'^ Eight specimens. 



Specimens from different localities average, respectively, as follows: 



