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Aimophila ruficeps australis average shorter Averages slightly birds boucardi X simulans Breast and flanks breast and sides Broccoli Brown browner less reddish buff buffier Chihuahua Cimarron County Coahuila Commentary dark Burnt Umber darker and browner Diagnosis DMNH duponti Durango eastern eremoeca X pallidisima extima Fresh fusca geographic variation gray grayish brown Guadalupe Mountains Guanajuato Guerrero Hair Brown Hidalgo intergrades Jalisco Juvenal plumage laybournae less grayish Mean S.D. Measurements Mexico Michoacan molt Museum of Natural Natural History Nayarit northern Nuevo Leon Oaxaca Oklahoma Olive pale paler and grayer phillipsi Puebla Range redder less brownish reddish brown Rufous-crowned Sparrow S.D. N Mean Saltillo San Luis Potosi scottii X eremoeca shorter in wing Sierra de Tamaulipas Sierra Madre Occidental significantly Sinaloa Sonora southeastern southern Oaxaca Specimens examined streaking and crown Subspecies suttoni tail length Tamaulipas Texas Tlaxcala Type locality typical upperparts Vandyke Brown variable Veracruz western wing and tail wing length Zacatecas