208. 
THE MAMMALS OF MOUNT MAZAMA. 
and there but belong more properly to the zone above. The most 
conspicuous undergrowth cotisists of ]\Ianzanita (Arctostaphylos 
patula), Buckbrush {Ceanothus velutinus) and Kvnzia tridentata. 
A characteristic flower is the handsome Gilia aggregata. 
Among the characteristic birds of the Transition Zone in the 
Klamath region are: Lewis' Woodpecker {Melanerpes torqaatus), 
the Pigmy Nuthatch (Sitta pygmaea), three small Flycatchers 
(Contopus richardsoni, Empidonax trailH and E. ohscurus), the 
Warbling and Cassin's Vireos (Vireo gilvus swainsoni and V. 
cassini), the Magpie (Pica hudsonica)^ Chipping Sparrow (Spizella 
sociaJis arizonae)^ Green-tailed Towhee (Oreospiza chlorura)^ 
Lazuli Finch {Passerina amoena)^ House Wren {Troglodytes aedon 
parkmani) and Western Blue- bird {Sialia mexicana occidentalis.) 
Few mammals are anywhere distinctive of the Transition Zone, 
most of its species coming from the zone below (Upper Sonoran) or 
the zone above (Canadian). Among those which reach their upper 
limit here are the Gray Fox (Urocyon), the Little Spotted Skunk 
(Spilogale)^ the large gray tree Squirrel {Sciurtis fossor), Round - 
tailed Woodrat {Neotoma fuscipes), Gray and Oregon Ground 
Squirrel {Spermophilus douglasi)^ Belding's Ground Squirrel 
{Spermophilus beldingi), the California Vo\e(Microtus califormcus)^ 
the California Mole {Scapanus californicus)^ the Sage Plains Jackrabbit 
(Lepus campestris)^ and LeConte's Bet {Antrozous palUdus). 
The Klamath Flying Squirrel {Sciuropterus klamathensis) is 
known only from the pines, but may inhabit the Canadian or lower 
Boreal also. The black-bellied Water Shrew (Atophyrax bendirei) 
and the Long- tailed Mountain Vole {Microtus mordax) inhabit the 
borders of the cold streams which flow through the Transition plane 
from the Boreal mountain sides, but probably belong to the Cana- 
dian fauna rather than the Transition. The 'Red' or small Pine 
Squirrel {Sciurus californictis) is common to the Transition and 
Canadian belts, but does not push up into the Hudsonian. Among 
the species which come down into the pines from the Boreal moun- 
tain sides are the Golden-mantled Ground Squirrel (Spermophilus 
chrysodeirus)^ the large and small Chipmunks (Eutamias senex 
and E. amoenus)^ the Sierra Marmot (Arctomys Eaviventer) and 
the Weasel (Putorius arizoneasis). 
