SEVEN NEW WHITE-WINGED DOVES 



13 



by two experienced collectors. They also may represent a separate 

 race, for this characteristic is not true of any other known population 

 of white-winged doves. 



The white-winged doves from the interior highlands of Sonora at 

 Tecoripa, Cerro Blanco, Opodepe, and Moctezuma probably are re- 

 ferable to monticola, judging from their dimensions, but inclusion 

 in this race should await further study of specimens and ecology. 



Several whitewings and a nest with a single nestling were found 

 in northern Coahuila at Noria de Gilberto, by Walter P. Taylor 

 and Clifford C. Presnall, April 9, 1945 (personal correspondence, 

 1945) . These birds probably were of the race monticola, since it 

 occurs north of this area in Brewster County, Texas (Van Tyne and 

 Sutton, 1937). 



The differences in habitats occupied by monticola in the lower Big 

 Bend and by asiatica at the northwestern corner of its breeding range 

 in Val Verde County, Texas, apparently serve as ecological barriers 

 and seem to be effective in maintaining the separateness of these 

 populations. In addition, the three long, narrow canyons of the 

 Rio Grande and the barren hills between the breeding ranges of 

 monticola and asiatica probably also assist in separating these races. 

 Although a strong flier like the white-winged dove could easily fly 

 this distance, no flights have been reported along this route. No 

 specimen of either monticola or grandis has been taken near Del 

 Rio, to my knowledge, nor do I know of a specimen of asiatica re- 

 ported from the Big Bend. 



SPECIMENS EXAMINED 



Mexico: Aguascalientes: Presa Calles. Chihuahua: Meoqui, Rio 

 Conchos, Rio San Pedro. Coahuila: Las Delicias, Piedra Blanca. 

 DisTRiTo Federal: Pedregal. Durango: La Boquilla, Las Bocas, Rio 

 Sestin, San Juan (C. Lerdo) . Guerrero: Chilpancingo, Colotlipa, and 

 Iguala. Hidalgo: Zimapan. Jalisco: Autlan, Bolanos, Hacienda La Ven- 

 ta. La Cienega, Santa Cruz, Tizapan el Alto (west of L. Chapala) , Villa 

 Corona, Zapotlan. Michoacan: Zamora. Morelos: Cuemavaca, Puente 

 de Ixtla, Temilpa. Nayarit: Amatlan de Canas, Hacienda de Ambas 

 Aguas, and Tepic. Oaxaca: Cuilapan (near Oaxaca) and La Compania 

 (near Ejutla de Crespo) . Puebla: Acatlan, Atotonilco, Chila, Huejotz- 

 ingo, Matamoros, Tecomatlan. San Luis Potosi: Hacienda Capulin, 

 Salinas Reg, and Santo Domingo. United States: Texas: Lower Big 

 Bend (Black Gap, Boquillas, Castolon, Lajitas, Pine Canyon, Still- 

 well Crossing, and Wade Canyon. New Mexico: Guadalupe Canyon 

 and Animas Mountains, Hidalgo County. All seasons are represented 

 by this series. 



