436' NORTH AMERICAN BIRDS. 



Dr. N'ewbeny observed this species quite common in California, but could 

 obtain no specimens, owing to the height at wliich they flew. He saw noth- 

 ing of it in Oregon. 



Two specimens of this species obtained in Mexico by M. de Saussure are 

 in the collection of Dr. Sclater. 



Mr. Eidgway saw on the Truckee Eiver, near Pyramid Lake, in May, 

 1868, what he supposes to have been this species. It was not common, 

 only a few individuals being observed every evening just before dusk, flying 

 overhead exactly in the manner of Chimney Swallows (C pelagica), which 

 they also exactly resembled in appearance. They flew so high that speci- 

 mens could not be obtained. They were entirely silent, and appeared at no 

 other time than in the evening, in these respects differing strikingly from 

 the eastern species. 



