FEBRUARY 258, 1905 VoL. IV, PP. 11-15 
PROCEEDINGS 
OF THE 
NEW ENGLAND ZOOLOGICAL CLUB 
NOTES ON THE DEER MICE (PEROMYSCUS) OF 
SOME OF THE ISLANDS OFF THE SOUTH- 
ERN NEW ENGLAND COAST. 
BY OUTRAM BANGS. 
DurRING twelve years past I have made several collecting trips 
to the various islands lying off the southern coast of New Eng- 
land, in the course of which Monomoy, Muskeget, Martha’s Vine- 
yard, Nantucket and Block Island have been thoroughly explored. 
On two of these trips I was accompanied by Gerrit S. Miller, Jr., 
and on one by Miller and Charles F. Batchelder. All of these 
islands are inhabited by 7eromyscus, as well as by several other 
species of small mammals; but in what way these little creatures 
reached the islands, or how long a time they have been on each, 
are questions it is idle to discuss. In some cases the amount of 
differentiation from the mainland stock can perhaps be taken as 
a criterion of the length of time the island has been inhabited. 
For instance, the deer mouse of Martha’s Vineyard is a well- 
marked island form, while that of Nantucket cannot be told with 
any certainty from the one of the mainland. Neither of these 
