A study of some social beetles in British Guiana and of their relations to the ant-plant Tachigalia . in some species, at least, are conspicuous andsweet-scented. The seeds were found only after they had germi-nated, and the trees showed no indications of flowering duringour stay in British Guiana. Our inference that they might bloomduring the winter months has not been confirmed, since up to thetime of this writing (March, 1921), Mr. Beebe has seen noflowers on any of the trees which Prof. Bailey marked for obser-vation. I trust, nevertheless, that my account of the Tachigalia-biocoenose will
A study of some social beetles in British Guiana and of their relations to the ant-plant Tachigalia . in some species, at least, are conspicuous andsweet-scented. The seeds were found only after they had germi-nated, and the trees showed no indications of flowering duringour stay in British Guiana. Our inference that they might bloomduring the winter months has not been confirmed, since up to thetime of this writing (March, 1921), Mr. Beebe has seen noflowers on any of the trees which Prof. Bailey marked for obser-vation. I trust, nevertheless, that my account of the Tachigalia-biocoenose will give such a picture of the astonishing complexityand exuberance of the insect fauna of the Neotropical Region,and of the fierce competition among these organisms on the one Introduction 37 hand and of their intimate co-operation on the other, as tostimulate some future investigator to complete my any rate, the following pages may serve to direct the atten-tion of our younger entomologists to one of the many wonderful,almost untouched fields for investigation in tropical LOCATION OF THE TROPICAL RESEARCH STATION OF THE NEW YORK ZOOLOGICAL SOCIETY The circle represents a radius of six miles. The Tachigalia. The Leguminous myrmecophytes of the genus Tachigaliacomprise more than a dozen known species of trees and shrubsbelonging to the forest formation (hytea) of the Guianas andthe Amazon basin. The first species, paniculata, was describedby Aublet as long ago as 1775, and re-described by Tulasne in1844. The former derived the generic name from the Caribtachigali, tachi being the term employed by the natives ofthe Guianas and Brazil for the stinging ants of the genus Pseu-domy7-ma, which regularly inhabit the swollen petioles of thespecies of Tachigalia and the hollow branches and trunk of thevarious species of Triplaris. Spruce (1869) was also familiarwith several species of Tachigalia and their ant-inhabited to our not finding the
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