2!)4 University of California Publications in Zoology [Vol. 10 



given only by the male. But it is. of course, probable that some 

 sort of a location note, or food call in the case of the young, is 

 possessed by this vireo, as with all other species of the family 

 known to us. 



Two nests were found in the vicinity of Kcnworthy, both on 

 May 21, each with three eggs, in one case moderately incubated. 

 in the other fresh. The field note account of the discovery of 

 the first nest gives inferential clue to some of the traits of this 

 vireo. After having followed up several singing birds without 

 success, a particular individual was located by its song on a 

 sparsely brushed hillside which gave promise of less difficulty 

 than usual in catching sight of the bird itself. "The song led 

 me up into the brush, and then stopped. After waiting some 

 time, it began again volubly, and I got a glimpse of a vireo as 

 it left a brush-clump and went off up the hillside through the 

 bushes, singing the while. Search disclosed a nest in the upper 

 tangle of a greasewood {Adenostoma fasciculatum) , with the 



female bird sitting closely ther ." Three photographs were 



secured of the nest, and one of the hillside. "The nest was 33 

 inches (about 850mm.) above the ground, hen' sloping, and 

 was discernible for several yards, though well surrounded by 

 the sparsely-leaved greasewood twigs. Many of the latter had 

 to be snapped off in order to obtain uninterrupted view of the 

 in si i see pi. 10, fig. 2). During all this commotion the bird only 

 sat the closer, winking often and occasionally turning her head 

 or twitching her wings. I touched her bill and head several 

 times, and finally picked her bodily from the nest. Meanwhile 

 the male remained at a distance, showing very little concern." 

 It will be observed that the general sequence of incidents is 

 similar to that in one's experience with other species of vireos. 



The second nest was found under much the same circum- 

 stances. It also was built in a greasewood bush, 36 inches above 

 the ground. The female was sitting, but was not so persistent 

 in remaining as the other, probably clue to the shorter propor- 

 tion of the incubation period so far completed. 



Both nests, with their complements of eggs, are preserved 

 in the Museum (sets nos. 74, 75). They are similar to other 

 vireo 's nests in shape and semi-pensile attachment. The main 



