CONTENTS. 



Page. 



Introduction 5 



Habits and economic status of moles 6 



Characteristics and development of the young 9 



Pelages and molts 11 



Geographic variation 16 



Individual variation 16 



Sexual variation 18 



Age variation 18 



Seasonal variation 19 



Explanations 19 



Material and acknowledgments 20 



The family Talpidse 21 



Subfamilies 22 



History 22 



List of generic names that have been used for American moles. . . 24 



Keys to the genera of moles 26 



List of American genera, species, and subspecies, with type localities 27 



Genus Scalopus 27 



Keys to species and subspecies 30 



Descriptions of species and subspecies 32 



Genus Scapanus 54 



Key to species and subspecies 57 



Descriptions of species and subspecies 58 



Gemis Parascalops 77 



Genus Condylura 82 



Genus Neurotrichus 92 



Key to subspecies 94 



Descriptions of species and subspecies 94 



Index 99 



• — 



ILLUSTRATIONS. 



PLATES. 

 [Folio-wing page 98.] 



Plate I. Molting process of Scalopus aquaticus aquaticus; young of a. Tiowelli. 



II. Skulls (dorsal view) of Scalopus aquaticus aquaticus, S. a. howelli, S. a. 

 australis, S. a. anastasse, S. a. parvus, S. a. machrinus, S. a. machrinoides, 

 S. a. pulcher, S. a. caryi, S. a. texanus, S. injlatus, and S. sereus 

 III. Skulls (ventral and lateral views) of Scalopus aquaticus aqvuticus, S. a. 

 howelli, S. a. australis, S. a. parvus, S. a. texanus, S. injlatus, and S. sereus. 



3 



