260 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



malar region also), narrowly margined with the same; foreneck and 

 chest buffy white or very pale buff, the feathers broadly margined 

 with black or dusky, producing a squamate effect; rest of under 

 parts similar but with mesial buffy or whitish area on each feather 

 narrower, the blackish Imes submargmal mstead of marginal, the 

 feathers broadly edged with light grayish olive or grayish brown, 

 this gradually increasmg (at expense of the whitish or buffy mesial 

 stripes and blackish lines) posteriorly, where, on flanks, lower abdo- 

 men, and under tail-coverts the light grayish brown predominates; 

 under wing-coverts ochraceous-buff, paler on margin of wing; inner 

 webs of remiges light cmnamon-rufous, the longer primaries gi'ayish 

 brown terminally; maxilla deep horn brown, darker basally; mandi- 

 ble paler, especially toward base; legs and feet horn color or dusky 

 (m dried skms). 



Young. — Similar to adults but blackish margms and edgings to 

 feathers of lower parts more irregular or broken, and color of back 

 more olivaceous (less tawny) brown. 



Adult 7/iaZe.— Length (skins), 219-235 (226); wing, 108.5-123 

 (116.9); tail, 93-103.5 (97.4); culmen, 32-37.5 (35.4); tarsus, 20-21.5 

 (20.8); middle toe, 15.5-17 (16.5). « 



Adult female.— Length (skins), 219-225 (222); wing, 108.5-115.5 

 (112); tail, 90-98 (94.9); culmen, 29.5-37 (34.4); tarsus, 20-21 

 (20.6); middle toe, 16-16.5 (16.2).^ 



Western and central Mexico, in States of Sonora (Nuri), Durango 

 (Coyotes; El Sal to; Ciudad Durango), Guanajuato, San Luis Potosi 

 (Sierra de San Luis Potosi), Vera Cruz (alpine zone of Orizaba), 

 Puebla (Tenango del Valle; Rio Frio; Ixtaccihuatl; San Salvador el 

 Verde), Zacatecas (Plateado), Mexico (near City of Mexico; Temas- 

 cal tepee), Morelos (Huitzilac), IMichoacan (Mt. Tancitaro; Patzcu- 

 aro; Quiroga, Lake Patzcuaro; Morelia; Nahuatzin), Jalisco (Sierra 

 de Bolanos; Sierra de Nayarit; Zapotlan; Hacienda de San Marcos; 

 San Sebastian; Tonila), Colima (Sierra Nevada), Guerrero (Amula; 

 Omilteme), and Oaxaca (La Parada; Cerro San Felipe), and Terri- 

 tory of Tepic (Santa Teresa). 



Xiphorhynchus leucogaster Swainson, Philoa. Ma<>., new ser.,i, 1827,440 (Temas- 



caltcpec, Mexico; coll. Bullock Mua.). 

 X[iphorhi/nchus] leucogaster Bonaparte, CoiiHp. Av., i, 1850, 208. 

 Picolaptcs leucogaster Lafresnaye, Rev. et Mag. Zool., March, 1850, 150. — 



ScLATER, Proc. Zool. Soc. Loud., 1858, 297 (La Parada, Oaxaca); Cat. Am. 



Birds, 18G2, 1G6; Cat. Birds Brit. Mus., xv, 1890, 147 (near City of Mexico; 



La Parada, Oaxaca; Ciuddd Durango). — Sumichrast, La Naturaleza, v, 1881, 



a Ten specimens. ^ Six specimens. 



