PLATE III. 



Fig. 1. Eunatisibius wheeleri Schwarz and Barber. X s. 



Fig-. 2. Coccidotrophns socialis Schwarz and Barber. X S. 



Fig-. 3. Cross section of base of very younp petiole of adult Ttnhifitil'<i. showins pith 

 still in the cavity. Photojfraph by Prof. I. W. Bailey. 



Kijr. 4. Cross section of base of large petiole of Tachigalia inhabited by Psiutktmyrma 

 damnosa. The dark areas in the wall are nutritive parenchyma, which is not 

 disturbed by the ants but nourishes their coccids. A portion of one of the carton 

 partitions is shown on the left side. Photograph by Prof. I. W. BaUey. 



Fig. 5. Cross section through one of the strands of nutritive parenchyma showing the 

 cells with their homogeneous, amber-colored contents. Photograph by Prof. 

 I. W. Bailey. 



