Plate 54 

Saguaro or giant cactus (Cereus giganteus), near mouth of Sabina Canyon, Santa 
Catalina Mountains. The openings in the trunk and branches lead to large sac- 
shaped cavities originally excavated by woodpeckers for nests, and afterwards 
occupied by several other species, as well as colonies of honey-bees. This speci- 
men is about 4ofeetinheight. (Reprinted from Publication No. 6.) 
