1911] Swarth: Alaska Expedition of 1909. 135 



Zapus hudsonius alascensis Merriam. Alaska Jumping Mouse. 



One specimen, an adult female, taken at Portage Cove, Revil- 

 lagigedo Island, July 1 (no. 8607) . It was caught at the entrance 

 to a tinj"- hole in the moss at the base of a large tree near the 

 edge of the forest. Numerous traps set in similar localities, as 

 well as in the adjoining meadow land, failed to bring any addi- 

 tional specimens to light. The one secured contained six embryos. 



This specimen was submitted to E. A. Preble, of the U. S. 

 Biological Survey, who remarks that it "belongs to the Z. hud- 

 sonius group, and as it seems to have some of the characters of 

 alascensis, I refer it to that form." Since the type locality of 

 alascensis is Yakutat Bay, over three hundred miles northwest, 

 south of which I believe it had not previously been taken, and 

 since we secured a different species of Zapus at an intermediate 

 point, it is desirable that more data be secured for the further 

 elucidation of this peculiar irregularity in distribution. 



Zapus saltator Allen. Stikine Jumping Mouse. 



An adult male secured on the Taku River on September 8 

 (no. 8608). I believe they were fairly abundant in the meadows 

 at this point, for on September 4 and 5 Hasselborg and myself 

 saw probably half a dozen in the grass. When the rainy weather 

 set in once more they were no longer to be seen. 



The single example obtained, as well as the specimen of 

 Z. h. alascensis, was identified by E. A. Preble. 



Erethizon epixanthum nigrescens Allen. Dusky Porcupine. 



Porcupines, or indications of their presence, were seen at 

 almost every mainland point visited. At Boca de Quadra several 

 were seen, and one killed but not saved as it was shedding badly. 

 On the Chickamin River many were noted, all shedding hair 

 and quills, some of them almost naked. There were many trails 

 through the long grass at this point, made by the porcupines on 

 their travels. At Bradfield Canal I saw but one, though the trees 

 bore abundant evidence of their presence. At Thomas Bay they 

 were fairly abundant. None were seen either at Port Snettisham 

 nor on the Taku River, though there was a little sign at the 



