CONTENTS. 



PAGE 



Historical sketch 5 



Introduction 5 



Botany 14 



Insects 24 



Other invertebrates 42 



Fishes 43 



Batrachians and reptiles 44 



Birds 46 



Mammals 52 



Early History of Man in the District 54 



Distribution of life in the District of Columbia region . . 57 

 The Piedmont Plateau and Coastal Plain as faunal and 



floral provinces 57 



Magnolia bogs near Washington, D, C, and their 



relation to the pine barrens 74 



Other types of collecting grounds in the District of 

 Columbia region 90 



Index to the U. S. Geological Survey's 1917 Map of Wash- 

 ington and vicinity 110 



Introduction 110 



Bibliography 112 



List of maps used 115 



Index 119 



MAPS 



The Piedmont Plateau and the Coastal Plain in the vicinity of 

 the District of Columbia. Page 61, also in pocket inside 

 back cover. 



Washington and Vicinity. U. S. Geological Survey, 1917. 

 Quartered and with index ruling. In pocket inside back 

 cover. 



[3 



