340 University of California Publications in Zoology [Vol. 12 



of which tules grow abundantly. The people told us that ducks 

 occur here plentifully during the winter and that a few stragglers 

 remain and nest. The water is used for irrigation, but the rocky 

 nature of the soil in this part of the valley makes agriculture diffi- 

 cult. Bird and mammal life centers close around the spring and 

 where the land is cultivated. We had hoped to obtain here, at the 

 type locality, specimens of Reithrodontomys megalotis klamathensis 

 and might have had better success if we had trapped in a hayfield. 

 As it was, near the spring, we did not get any. One farmer re- 

 ported kangaroo rats as being abundant in the upper part of the 

 valley where the soil is better and farming is carried on to a greater 

 extent, but we saw no sign of them ourselves. Sage-brush grows 

 on the rocky, uncultivated ground, and the scattering trees are 

 juniper and small yellow pine. The region is distinctly Upper 

 Sonoran in zone. We stayed here only two days, and then went 

 to Gazelle, a small town on the line of the railroad and the first 

 station north from Edgewood. While staying there over the night 

 of June 6 so as to get the stage to Callahan, we set a few gopher 

 traps in an alfalfa field close to the town, securing specimens of 

 Thomonvys leucodon navies. Our observations were naturally lim- 

 ited, but indications pointed to the same zonal position as Mayten, 

 namely Upper Sonoran. 



We left Gazelle the morning of June 7 by stage for Callahan, 

 twenty-five miles to the west and at the south end of Scott River 

 Valley. We passed over a divide of about five thousand feet alti- 

 tude and reached Callahan a little after noon. As the immediate 

 vicinity of the town did not look favorable for collecting we drove 

 about six miles down the valley and made camp on a small slough 

 tributary to the Scott River. According to report there was still 

 too much snow in the mountains for us to attempt to go up to a 

 high altitude, so we put in the time from June 8 to 14 collecting 

 at this camp. 



Scott River Valley is a fertile stretch sonic twenty-four miles 

 long and varying in width from one to six miles. It is hemmed in 

 on the east by low rocky hills covered with sage-brush and ceano- 

 thus, with a scattering growth of yellow pine and oak (see pi. 15, 

 fig. 1). On the western side the hills are somewhat more rugged 

 and heavily timbered, and numerous small streams make their way 

 down narrow canons into the main river. The town of Callahan 



