FRONTISPIECE 



Ci. 



1 





r*^,^':^ 



A mature plant of Opuntia fulfjidu on reservation of Desert Laboratory at Tucson, showing 

 a frequent type of forked trunk, due to injury of main axis, also the branching habit 

 and clusters of fruit. The nesting bird is the cactus wren, Heleodytes brunneicapillus 

 couesi (Sharpe). 



