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 132 THE CONDOR Vol. XIX cure typical species of the eastern Cascade slopes. Good collections vere made at .Gatevay and Haycreek, and some vork vas done on Foley Creek in a spur of the Blue Mountains east of Haycreek. Central Oregon lies between the Cascade and Blue mountains. The coun- try is a high plateau and the rivers flov through deep canyons. The Deschutes is the principal river fioving north. The John Day River and Willov Creek flov into the Columbia in GillJam County. Warm Spring River and the Meto- lius are the largest tributaries floving into the Deschutes from the vest, while Fig. 49. CLIFFS ON WARM SPRING RIVER, NORTH-CENTRAL OREGON; SUITABLE NESTING SITES HERE AFFORDED FOR SAY PHOEBE, RAVEN, AND WESTERN RED'TAILED HAWK. Crooked River is the main tributary from the east. The former rises high in the Cascade Mountains, vhile the latter comes from the high Blue Momtains. A considerable part of this high dry area is in the Upper Sonoran life zone. In northern Sherman and Gilliam counties there are still large areas of bunch- grass; but as this land is rapidly being broken up and the grazing land turned into vheat ranches, some of the Upper Sonoran species vill diminish in num- bers to be replaced by those Transition species vhich increase vith the culti- vation of the country. The most conspicuous and abundant plant of the Upper