PLATE 9 



Fig. 12. Giant cactus (Cereus giganteus) on California side four miles 

 north of Potholes. A palo verde stands immediately beyond, its trunk being 

 nearly hidden by that of the cactus. The extreme height of the latter was 

 28 feet. Openings may be seen in the upper branches. Two of these were 

 inhabited by a pair each, respectively, of the Gila woodpecker and ash-throated 

 flycatcher. Photograph taken April 23, 1910. 



Fig. 13. Giant cactus on California side four miles above Potholes, photo- 

 graphed April 23, 1910. In a hole in this cactus was found a brood of gilded 

 flickers (just beneath short left-hand branch), and three feet higher up in a 

 cavity opening on the opposite side of the trunk was a saguaro screech owl. 



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