390 BOTANICAL GAZETTE [DECEMBER 
of Cecropia adenopus and of other myrmecophytic species of Cecropia 
are not allurements, acquired through natural selection, is indicated 
by the fact that such structures occur on certain species of Cecropia 
and other plants which are not frequented by ants. The Aszfeca- 
Cecropia associations, and ant-plants in general, are extremely 
interesting cases of parasitism, which illustrate the remarkable 
adaptiveness of ants in availing themselves of the potentialities of 
given environments. This is shown, not only in the utilization of 
the preformed food bodies, prostomata, and internodal cavities, 
but more strikingly in the structural modifications produced within 
the plants for the growth and tending of coccids. Thus, the ants 
are able to obtain food from the plant in two ways, fats and proteins 
directly from the Miillerian corpuscles, and carbohydrates vicari- 
ously through the coccids. 
I wish to thank WiLL1aM BEEBE for numerous courtesies during 
my visit to the Tropical Station of which he is in charge. To the 
directors of the Gray Herbarium of Harvard University, the New : 
York Botanical Garden, and the Berlin Museum, and to Dr. 
Emit SNETHLAGE I am indebted for many helpful taxonomic data. 
These investigations were conducted under a grant from the Ameri- 
can Association for the Advancement of Science. 
Bussey INSTITUTION 
oREST Hitis, Mass, 
LITERATURE CITED 
1. Battey, I. W., The anatomy of certain plants from the Belgian Congo, 
with special reference to myrmecophytism. Bull. Amer. Mus. Nat. Hist. 
45:585-621. 1921-1922. 
2. Bett, T., The naturalist in Nicaragua. London. pp. xvi+403. 1874. 
3- Firsric, K., Cecropia peliata und ihr Verhaltnis zu Azteca alfari, zu ge 
sexdens, und anderen Insekten, mit einer Notiz iiber sen aa 
Acacia cavenia. Biol. Centralbl. 29:1-16; 33-55; 65-77. 
4. HERING, H. von, Die Cecropien und ihre SPrhes iy Engler s Bot. 
Jahrb. 39:666—714. 1907. 
5. Moétter, A., Die Pilzgirten einiger siidamerikanischer Ameisen. Bot. 
Mitteil. aus ies Tropen. Jena 6:pp. vi+127. 1893. 
6. M@LLeR, Fritz, Die Imbauba und ihre Beschiitzer. Kosmos 8: 109-116. 
1880-81. 
