EGGS OF NORTH AMERICAN BIRDS. 53 



Washington Territory and New Mexico south to Guatemala, 

 in April. 



312a. Viosca's Pigeon, Columba /asciata vioscce. A new 

 sub-species, described by Mr. Brewster in the "Auk" for Janu- 

 ary, 1888. Breeds in Lower California. Eggs unknown. 



313. Red-billed Pigeon, Columba Jlavirostris. Eggs, 2, 

 creamy; 1.00 -\- 1.45 to 1.06 -j- 1.48. Breeds on the southern 

 border of the United States, from Arizona and the Rio Grande 

 Valley, south to Costa Rica. 



314. White-crowned Pigeon, Columba leucoce2:>hala. 

 Eggs, 2, creamy white; 1.02 -}- 1.40 to 1.05 -\- 1.45. Nests 

 placed on the ground or on bushes or low trees. Breeds on 

 the Florida Keys, Bahamas, Greater Antilles, and coast of 

 Honduras, in June. 



315. Passenger Pigeon, JEctopistes migratorius. Eggs, 

 elliptical, sometimes oval, white; 1.00 -|- 1.50 to 1.12 -f- 1.55. 

 Breeds in suitable locations, in Eastern North America, from 

 Hudson's Bay south, at least to Pennsylvania, and west to the 

 Great Plains. Now very rare even in the wildest sections. 



316. Mourning Dove, Zenaidura ynacroura. (Type, 

 Plate IX.) Eggs, often oval, varying from white to creamy; 

 .75 + 1.02 to .90 -f 1.23. Nests in trees. Breeds through- 

 out North America, from Southern ]\Iaine, Southern Canada, 

 and Oregon, south to Panama and Key West ; in May, or 

 earlier, in the more southern sections. 



317. Zenaida Dove, Zejiaida zenaida. Eggs, white ; 1.00 

 -|- 1.20 to 1.05 -f- 1.30. Nests placed on the ground or in trees 

 or bushes. Breeds rarely on the Florida Keys, not uncom- 

 monly on the Bahamas, Greater Antilles, and coast of Yucatan, 

 in May and June. 



318. White-fronted Dove, Engypilla albifrons. Eggs, 

 creamy; .88 -[- 1-17 to .98 -\- 1.25. Br(>eds in the valley of 

 the Lower Rio Grande in Texas, and southward to Guatemala, 

 in April. 



