682 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



brighter yellow along the outer web, grayish toward their ends, the 

 first primary margined with pale olive-yellow; bastard- wing feathers 

 dusky brown, narrowly edged with olive-yellow, bright yellow along 

 the edge of the outer one, like the edge of the wing; tail-feathers 

 olive-yellowish [i. e., olive-greenish]; crown of head bluish gray, the 

 occiput and nape like back; a broad band of black across the forehead; 

 feathers above and around the eye, cheeks, and ear-coverts black;' the 

 gray of the head skirting the ear-coverts at the sides of the neck; 

 entire under surface of body brilliant yellow, a little paler on the under 

 tail-coverts; sides of body and flanks, as well as the thighs, olive-green; 

 under wing-coverts brilliant yellow, the axillaries more olive-yellow; 

 edge of wing bright yellow; quills dusky below, ashy along the edge 

 of the inner web. Total length, 127; culmen, 15.2; wing, 61; tail, 50.8; 

 tarsus, 22.9."' 



Province of Chiriqui, Colombia (Volcan de Chiriqui). 



Geothlypig chiriquensis Salvin, Ibis, 3d ser., ii, Apr., 1872, 148, in text {'Volcan de 



Chiriqui, Veragua; coll. Salvin and Godman). — Salvin and Godman, Biol. 



Centr.-Am., Aves, i, 1881, 152, pi. 9, fig. 1.— Shakpe, Cat. Birds Brit. Mus., 



X, 1885, 362, pi. 9, fig. 6. 

 [_Geothlypw] chiriquensis Sclatee and Salvin, Nom. Av. Neotr., 1873, 10. 

 [Geothlypis cequinoctialis] fi. chiriquerms Salvin, Ibis, April, 1872, 149. 

 [Geothlypis xquinociialis] y. chiriquensis Ridgway, Am. Jour. Sci., iv. Dee., 1872, 



458. 

 Geothlypis sequinoctialis var. chiriquensis Ridgway, Am. Jour. Sci., iv, Dec, 1872, 



458. 



GEOTHLYPIS SEMIFLAVA BAIRDI (Nutting). 

 BAIRD'S YEllOW-THROAT, 



Similar to G. s. sem ifl.dva, but with shorter tail and tarsus and larger 

 bill.'' 



Adult male in sjjring. — Forehead and at least anterior half of crown 

 (sometimes whole crown), together with loral, orbital, auricular, and 



' According to the colored figure in Cat. Birds Brit. Mus., x, pi. 9, fig. 6, the malar 

 region also is black, instead of yellow as in G. velata. 



^Sharpe, Cat. Birds Brit. Mus., x, 1885, 362, 363. The measurements converted 

 from inches and tenths to millimeters. 



'I continue to separate the Central American bird from true G. semiflava of Ecuador, 

 at least provisionally. All the Central American specimens examined differ from the 

 single Ecuadorean skin available for comparison in shorter tail and tarsus and larger 

 bill, as mentioned above; furthermore, the Ecuadorean specimen has the posterior 

 extremity of the black mask continued along each side of the lower throat for a con- 

 siderable distance, and almost forming a collar across the upper chest. A^ong the 

 five adult males from Central America only one shows the slightest approximation to 

 this last-mentioned character. Otherwise, they are all very much like the specimen 

 from Ecuador, and it may be that a series of specimens from the latter country would 

 show that no constant difference really exists, in which case the alleged Central 

 American subspecies could not, of course, be maintained. 



