1922] Swarth: Birds and Mammals of the Stikine Region 181 



TABLE IV 



Measurements in millimeters of adult Ondatra 



Hind 

 Total length Tail vertebrae foot 



30996 Q ad. Sergief Id., Alaska 502 235 76 



30998 cf ad. Sergief Id., Alaska 520 225 74 



31006 r? ad. Sergief Id., Alaska 590 246 77 



Average of 4 adults of Ondatra z. spatulata, 



northern British Columbia and Alberta' 530 232 74;6 



Average of 10 adults of Ondatra z. osoyoosensis, 



from Oroville, Wash.^ 589 271 83 



iHollister, 1911, p. 22 

 sHollister, 1911, p. 25 



Mus musculus musculus Linnaeus. House Mouse 

 One specimen preserved (no. 30910), an immature female caught 

 at Sawmill Lake, June 12 ; several were trapped in a warehouse at 

 Telegraph Creek. Allen (1903, p. 540) has recorded the occurrence 

 of Mus musculus at Telegraph Creek in 1902, and it has probably been 

 established there since a much earlier date, but from our experience 

 it would seem not to be increasing in numbers or extending its range 

 to any extent. It is an interesting fact that we did not obtain any 

 at Glenora. House mice must have been there when the town was 

 occupied by people. Apparently upon the withdrawal of the human 

 population, the introduced Mus musculus was unable to compete suc- 

 cessfully with the native Peromyscus, even under as favorable condi- 

 tions as prevailed in the wooden houses of the abandoned city. 



Zapus saltator Allen. Stikine Jumping Mouse 

 Found only near Telegraph Creek and at Glenora. The former 

 is the type locality of this species (see Allen, 1899, p. 3) and a special 

 effort was made there to get a series but the mice were not so numerous 

 as at Glenora. Altogether, thirty-seven Stikine jumping mice Avere 

 preserved (nos. 30911-30945, 31048, 31049) , as follows: from The 

 Junction, 1 ; Telegraph Creek, 7 ; Glenora, 29. All that were taken 

 were adults. No young ones were seen and no gravid females were 

 collected until June 30. After that date embryos, three to five in 

 number, were found in most of the females taken. 



At Telegraph .Creek specimens were caught in traps set about the 

 edge of Sawmill Lake, mostly in thickets or under logs. At Glenora 

 the jumping mice were found using Microtus runways extensively. 



