PLATE 8 



Fig. 10. Ironwooi] tree (Olneya tesota) photographed March 10. 1910, in the 

 wash pictured in the previous plate. This individual, an unusually large one, 

 was 90 inches in circumference of trunk two feet above the ground, 31 feet 

 in extreme height, and with a foliage expanse of 50 feet. The thorny branches 

 afforded protection to several nests, old and new, of the verdin. The blossoms 

 of this plant, which appear in May, attract numerous hummingbirds. 



Fig. 11. Palo verde tree (Parhinsonia torreyana) of unusual size. At the 

 time of blossoming, in April, this tree is resorted to by many migrating birds, 

 both for the flower nectar and the insects. Like other elements in the wash 

 association the palo verde is frequented by verdins, plumbeous gnatcatchers 

 and cactus wrens. Photograph taken February 27. 1910, on the Arizona side 

 above Mellen, near the mouth of the Sacramento wash. 



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