Excerpt from The Geographic Distribution of Animals and Plants in North America The Tropical Region comprises Central America, the greater part Of the coastal lowlands of Mexico, and the Antilles. It enters the United States at three points, southern Florida, the lower Rio Grande region in Texas, and the valley Ofthe lower Colorado River in western Ari zona and southeastern California. The various zones have been studied in the field by the division and their boundaries located and mapped over extensive areas. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.