﻿CONTENTS. 



Page. 



Material •. 7 



Changes in color of 8i)ecimeus preserved in aleohol 8 



Sexual variation 8 



Age variation 8 



Geograpliic variation 9 



Geographic distribution 10 



Migration 10 



Measurements 11 



Illustrations 12 



Nomenclature of North American Vesj)ertilionidje 12 



1. Generic and subgeneric names 12 



2. Specific and subspecific names 20 



Lists of North American Vespertilionida* 38 



Descriptions 41 



5 



