﻿CONTENTS, 



Page. 



Introduction .* 5-7 



Subgenus Putorius (the ferrets) 7-9 



Subgenus Ictis (the ^veasels) 9 



List of North American weasels 10 



Descriptions of species 10-32 



Table of cranial measurements 33 



ILLUSTRATIONS. 



(All natural size.) 



PLATES. 



Frontispiece. Heads of Black-footed Ferret and Bridled Weasel. 



1. Skulls of Putorius nigripes and P. imtorius. 



2. Skulls of Putorius arcticus, alascensis, cicognani, streatori, and rixosus. 



3. Skulls of Putorius frcnatus, longicauda, and tropicalis. 



4. ^'k.nWS) oi Putorius noveboracensis, wasMngtoni, nnd 2)eni)isula'. 



5. Skulls of Putorius longicauda, cicognani, novehoracensis, rixosus, lieninsulcv, and 



arcticus. 



TEXT FIGURES. 



1. Putorius nigripes, $ old. Trego County, Kans. 



2, 3. Putorius cicognani, $ ad. Elk Kiver, Minnesota. 



4-6. Putorius novehoracensis, $ ad. Adiroudacks, New York. 

 7-9. Putorius longicauda, $ ad. Fort Sisseton, S. Dakota. 

 10, 11. Putorius longicauda spadix, 9 • Elk River, Minnesota. 

 12-14. Putorius arizonensis, $ ad. Boulder County, Colo. 



15. Putorius frenatus, $ ad. Cofre de Perote, Vera Cruz, Mexico. 



16. Putorius tropicalis, 9 ad. Jico, Vera Cruz, Mexico. 



4 



