18 



NORTH AMERICAN FAUNA 65 



rnearnsi from Arizona, it averages browner, the wing of the male is 

 longer and the culmen shorter; in the female the tail and culmen 

 are shorter. 



DESCRIPTION 



Type, U. S. Nat. Mus. (Fish and Wildlife Service Collection) No. 

 481590, adult male, breeding, near Progreso, Department of Jutiapa, 

 Guatemala, elevation approximately 3,100 feet, March 13, 1942, col- 

 lected by George B. Saunders, collector's number 1622. Crown dark 

 vinaceous drab; hindneck vinaceous drab; back olive brown; tertiaries 

 Front's brown; middle rectrices mummy brown; throat and breast 

 nearest buffy brown; abdomen pale drab gray; and flanks pale quaker 

 drab. 



MEASUREMENTS 



Males (52 specimens) : wing 158.0-169.9 mm. (av. 162.6), tail 108.0- 

 121.9 (113.0), culmen 17.5-22.0 (20.0). Females (22 specimens): 

 wing 151.0-165.6 mm. (av. 157.4), tail 103.7-111.0 (107.0), and cul- 

 men 18.1-22.1 (20.1). 



RANGE 



Southernmost Mexico from southeast of the Isthmus of Tehuantepec 

 (Oaxaca and Chiapas) through Central America to the Guanacaste 

 district of Costa Rica (Carriker, 1910) , chiefly on the Pacific slope. 



REMARKS 



Field studies and specimens indicate that collina occurs in the dry 

 woodland and thorn forests of the coastal plain foothills and lower 

 mountains of the Pacific slope, and in many of the arid interior valleys, 

 including some in the Caribbean drainage. In some places, as at Punta 

 Piedra, Costa Rica, on the Gulf of Nicoya, collina breeds locally in the 

 coastal lowlands. It is not known whether it also nests in mangrove 

 swamps there. 



In some localities on the Pacific slope of Guatemala and El Salvador 

 during winter months every white-winged dove I collected was asiatica; 

 in other places they were in equal numbers with collina, and in yet 

 other habitats only a few miles away I found only collina. In some 

 instances collina was the only race present in the thorn forest, and 

 asiatica was often more common in valleys that had extensive weed 

 fields and farms with grain. 



One specimen of collina, labeled Panama, is probably from Guate- 

 mala. Ridgway (1916, p. 380) wrote, "There is a specimen in the 

 collection of the Carnegie Museum labeled Nata, Cocle, Panama (no. 

 20777; Heyde and Lux, collectors) ; but this is evidently referable to 

 the larger and grayer form from western Mexico, and if really from 



