1916] Grinnell: Analysis of Trinity Fauna 401 



Table 2. Boreal species of the Trinity region which are identical with, 

 or show closest affinities to, representatives on the Sierra Nevada, but not on 

 the Cascades. 



MAMMALS 



Sorex vagrans amoenus (very slightly differentiated from 8. v. 



vagrans, of the humid coast belt and the Cascades). 

 Mustela muricus. 

 Microtus rnontanus montanus (found only at Mayten; occurs also in 



the Klamath region at extreme southern end of Cascades). 

 Thomomys monticola pinetorum (very slightly different from T. m. 



monticola of the Sierra Nevada). 

 Zapus trinotatus alleni. 

 Aplodontia chryseola (decidedly different from A. californica of the 



Sierra Nevada). 

 Sciurus douglasii albolimbatus. 

 Glaucomys sabrinus flaviventris. 



BIRDS 



Dendragapus obscurus sierrae (intergradient towards the humid 



coast form fuliginosus) . 

 Sphyrapicus varius daggetti. 

 Cyanocitta stelleri frontalis (slightly intergradient towards the coast 



form carbonacea) . 

 Junco orcganus thurberi. 

 Passerella iliaca megarhyncha. 



Table 3. Boreal species of the Trinity region which are identical with, 

 or show closest affinities to, representatives on the Cascade Mountains, but 

 not on the main Sierra Nevada. 



MAMMALS 



.Mustela saturata. 



Neotoma cinerea occidentalis (occurs also on northern Sierra Nevada 



and locally to the coast). 

 Erotomys obscurus (also on extreme northern Sierra Nevada). 

 Lepus wasMngtonii klamathensis (the snowshoe rabbit reported under 



this name from the central Sierra Nevada, is probably distinct 



from klamatJiensis) . 



BIRDS 

 (none) 



Table 4. Boreal species of the Trinity region which are identical with, 

 or show closest affinities to, representatives in the humid coast belt. 



MAMMALS 



Scapanus latimanus latimanus (wide ranging zonally to the south- 

 ward through the coast ranges; not a typical humid coast form; 

 group relationships not yet worked out satisfactorily). 



