BIRDS OP NORTH AND MIDDLE AMERICA. 



391 



86-96 (90.7); tail, 85-103 (93.7); exposed culmen, 11-14 (12,5); 

 tarsus, 15-16.5 (15.8); middle toe, 14-16 (15.1).° 



Adult female. — Similar to the adult male and often not distinguish- 

 able, but usually(?) with the dusky bars on under parts somewhat 

 narrower; length (skins), 190-221 (206); wing, 87.5-95.5 (90.1); 

 tail, 85-102 (93.2); exposed culmen, 11.5-13.5 (12.4); tarsus, 15- 

 16.5 (15.7); middle toe, 13.5-16 (15) . 6 



Young. — Similar to adults but anterior under parts slightly paler 

 and less vinaceous, dusky bars on under parts narrower and (usually) 

 much less distinct, and wing-coverts and posterior scapular with a 

 subterminal mottling of pale grayish buffy. 



Southern Texas (Laredo; El Paso; Columbus; Hidalgo; casual or 

 occasional at Corpus Christi, Austin, San Antonio, and Kerrville), 

 southern Arizona (Tucson; Phoenix), and Lower California (La Paz), 

 and southward through Mexico, in States of Sonora (Rio Mayo; 

 Nacosari; Opodepe; La Chumata; Guaymas), Chihuahua (Tamas- 

 achic), Nuevo Le6n (Rodriguez; Calderita; San Augustin; Vaqueria 

 Topo Chico; Rio de la Gilla), Tamaulipas (Nuevo Laredo; Aldama; 

 Tamesi; Hidalgo; Altamira), San Luis Potosl (Soledad), Puebla (Hue- 

 xotitla; Altotonilco), Vera Cruz (Orizaba; C6rdova; Catemaco; 



° Twenty specimens. 



Twenty-nine specimens. 



Locality. 



Middle 

 toe. 



MALES. 



One adult male from Texas 



One adult male from New Mexico 



Four adult males from Arizona 



One adult male from Sinaloa 



One adult male from southern Tamaulipas 



Two adult males from Vera Cruz 



One adult male from San Luis Potosl 



Five adult males from Oaxaca 



Five adult males from Guatemala 



Three adult males from Honduras 



Five adult males from Nicaragua 



FEMALES. 



Five adult females from Arizona 



One adult female from Sinaloa 



One adult female from Nuevo Le6n 



Two adult females from Tamaulipas 



One adult female from Vera Cruz 



Two adult females from San Luis Potosl. . . 



Three adult females from Oaxaca 



Two adult females from Guatemala 



One adult female from Honduras 



Two adult females from Nicaragua 



15 



14 



15.1 



14.6 



15 



15 



15 



15.6 



15 



14.7 



15.2 



14.5 



14 



15.5 



15.7 



15.5 



15.5 



15.7 



15.2 



13.5 



14.2 



While individual variation is considerable in a series from any locality, there is 

 apparently none correlated with geographic range. All the characters attributed to 

 S. i. dialeucos break down completely when the full series is compared. 



