R. K. Selander, 1954 March 12 North of the Río Nazas, Durango, México. As I approached a cholla which held a single nest placed about 3½ feet above the ground & heard a cactus wren giving a soft gua-gua-gua-gua call. Very soft and sounded as if it came from a distance. The bird may have been in the nest but as I approached it hopped up on the tip branch of the cholla where I shot it. No eggs in nest but it looked as if it had recently been built or repaired — lined with quail & thrasher feathers and cotton. (Several nests examined near Jiménez were lined with cotton and feathers — duck wing feathers in one case). The larger nests examined had tunnel entrances while the smaller and more poorly built nests lacked the tubular entrance portion. Several other nests placed in cholla near the one mentioned above — all within an circle with diameter 30-40 yds. All may have belonged to this one pair. While I was returning to the road I found another cactus wren about #20 yds from the place where I collected the first. This one I also shot. It probably was the mate of the first, [No — since both were males, nos. 1734-35]. The trees along the Río Nazas were in leaf and from there south we noted an increase in the number of trees and bushes which were in leaf — a decided change from conditions farther north. All the area from El Entroque to Nombre de Dios is