MAMMALS IN THEIR RELATION TO SPOTTED FEVER. 



23 



MINK. 



{Lutreola fison cncrgumenos.) 



Minks occur sparingly along the Bitterroot Eiver and some of its 

 principal tributaries. None were examined for ticks. 



riSHER. 

 {Must Chi pennanti.) 



Occasionall}^ fishers are taken in the mountains on both sides of 

 the valley, but I secured none. 



* MARTEN. 



(Mustela c. origenes.) 



Martens are rather plentiful. in the mountains on both sides of 

 the Bitterroot Eiver and afford one of the staple furs of the region. 

 From one caught early in March on Bass Creek a species of Ixodes 

 was taken. 



WOLVERENE. 



{Gulo 1 use us.) 



An occasional wolverene is caught by trappers in the mountains 

 around the valleys, but they are becoming rare. 



COMMON SHREW. 

 (Sorer personatus.) 



These little shrews occur in the grass-grown depressions on the 

 benches on the east side of the valley and were found also in a dry 

 hayfield soutliAvest of Florence. Xone Avere examined for ticks, and 

 they are probably too small to harbor anything but seed ticks. 



DUSKY SHREAV. 

 (Sorer ohscurus.) 



These shrews are common in damp meadoAvs and swamps through- 

 out the A'alley up to at least 3,700 feet. Many specimens were ex- 

 amined, but no ticks found on them. 



AVATER SHREAV. 

 (Neosorc.r navigator.) 



^^ater shrews occur along the creeks from well up into the moun- 

 tains down to the riA^er. It is highly improbable that they serA^e as 

 tick hosts. 



[Cir. 82] 



