146 



BULLETIN no, UNITED STATES NATIONAL MUSEUM. 



SIALIA SIALIS FULVA Brewster. 



AZURE BLTJEBIRD. 



Similar to S. s. sialis, but ruddy brown of under i)arts much paler 

 (between cinnamon and vinaccous-cinnamon, but nearer the former), 

 much less stronj^ly defined against white of abdomen; axillars and 

 under wing-coverts pale gray or grayish white instead of grayish 

 blue; blue of auricular and suborbital regions much duller; blue of 

 upper parts greener (cerulean to cobalt, averaging nearer the former); 

 wings and tail averaging longer (both absolutely and relatively). 



Adult maZc.— Length (skins), 142-171 (159); wing, 98.5-109 

 (103.9); tail, 63-71.5 (66.9);, exposed culmen, 11.5-14 (12.6); tarsus, 

 19-21 (20.2); middle toe, 14.5-17 (15.7).« 



Adult female. —Length (skins), 149-163 (153); wing, 96-104.5 (99.6) 

 tail, 59.5 67 (63); exposed culmen, 11.5-13.5 (12.7); tarsus, 19-21.5 

 (20.2); middle toe, 14.5-16.5 (15.6).^ 



Mexican plateau, in States of Vera Cruz (Cordova; Jakpa; Orizaba;, 

 Mirador; Cerro del Gallego; Jico), Oaxaca (La Parada; Juquila; Suchi- 

 stepec; Cerro San Felipe), Puebla (vSan Martin Texmelucan; Huachi- 

 nango), Mexico (Valley of Mexico), Ilidalgo (Real del Monte), 

 Michoacan (Patamban; Mount Tancitaro; Ilruapam), Jalisco (La 

 Laguiia; Jacala), Sinaloa (Plomosas; Sierra de Choix), Sonora 

 (Bavispe River), Chihuahua (Batopilas; Mina Abundancia), and 

 Guanajuato (Moro Leon), and northward into southern Arizona 

 (liuachuca and Santa Rita Mountains) ; southward in winter to 

 Chiapas (Tenejapa, November 30), and northern Guatemala (Haci- 

 enda Chancol, January). 



" Twenty-seven sjjeciinens. 

 b Twelve specimens. 



Si^ecimens from eastern Mexico compare with those from western Mexico, Arizona, 

 etc., as follows: 



Apparently there is no difference in coloration, 



