Ardea herodias.-- This Heron has been found everywhere along 
the Mexican Boundary Line where there were waters containing the 
fishes or batrachians upon which it feeds. Occasionally some were 
seen on dry plains, such as the Amimas near Lang's Ranch, during the 
dry period. Though myriads of Great Blue Herons were seen along the 
lower Gila and on the Colorado from the Gila to the Gulf of Cali¬ 
fornia no nests were found until April 14, 1894, when a rookery of 
Great Blue Herons was discovered in a lagoon of Salton River at 
Gardner's Lagoon. It was situated in a shallow lagoon, the nests, 
about 50 in number being placed on a grove of dead mesquite-trees 
which the overflowing by water had killed. Probably the rookery 
had been occupied for several years, as some of the nests were 
bulky and contained decayed material. As I approached the spot, 
on horseback, I was surprised at the tameness of the Herons, which 
was inexplicable until I discovered that they were standing upon the 
trees containing their nests. Tying my horse, I waded into the 
centre of the colony, the birds nearly all left the spot and flew 
away to a distant shore or else soared in the air above me croaking 
loudly. A flock of Cormorants flew from beneath the trees and 
numbers of ducks and Ibises were put to flight. Climbing with 
difficulty through the brittle spiny branches to a nest at the top 
of a tall mesquite. I was able to get a pretty comprehensive view 
of things. 
