156 University of California Publications in Zoology. [Vol. 7 



that at our camp on the east side of Warren Island the beach 

 was strewn with the wreckage of a ship that had gone on the 

 rocks on the west side of Coronation Island some months pre- 

 viously. Although the two islands lie on different sides of 

 a channel through which the prodigious tides of the region rush 



DISTRIBUTION 



Fkro/nuscus man/'cu/afus 



macror/j/nus 

 Fkromuscus maniculatus 



jscus siinensjs 



SOUTHEASTERN ALASKA 



Fig. 3. — Map showing the distribution of the species of Peromyscus 

 in southeastern Alaska. Vertical lines indicate the range of P. manicu- 

 latus macrorhinus, diagonal lines, P. m. hylaeus, horizontal lines, P. sitkensis. 

 Note the peculiarly disconnected range of Peromyscus sitkensis. 



back and forth twice daily, it is evident from this fact that it 

 is quite possible for something to drift from Coronation to 

 Warren, at any rate. 



The distribution of the mouse mentioned above (Peromyscus 

 sitkensis) is in itself of considerable interest (see text figure 3, 



