May, 1920 HOME LIFE OF THE WESTERN WARBLING VIREO 87 
ble bits of down from willow seeds, with many more woven in securely ; several 
bits of lichen (Alectoria fremontit) ; small strips of ninebark ( Opulaster pauci- 
florus) ; three small pieces of old discolored cotton; and, in the rim, bits of 
matted cow hair. There being four houses less than one hundred yards from 
the nesting site, the string, horsehair and cotton were no doubt obtained on or 
near those premises; the balance of the material could have been secured a few 
feet from the nest. In weaving the long piece of string, one end must have 
dropped down, and in picking up the loose end it had been passed under a 
Fig. 17. NEST OF WESTERN WARBLING VIREO, UNDER 
CONSTRUCTION FOR TWO DAYS. THE RIM IS FINISHED 
FIRST. 
small twig below the nest, forming a long hanging loop that remained in place 
during the occupancy of the nest, as shown in the photos. 
The bulk of the nest, if not the entire structure, was built by the female. 
The male remained in nearby trees, singing at regular intervals, but he was 
not noted helping at any time. As in the case of the former nest, several days 
passed after it was finished before any eggs were laid. The first egg in the 
second nest was noted on June 4. Visited late in the afternoon of the 7th, the 
nest contained four eggs; the complete set. 
The young willow in which the nest was placed was growing in a small 
