1914] Grinnell: Mammals and Birds of the Colorado Valley 55 



7. Lower Chemehuevis Valley, California side; camp at edge of 

 whirlpool and in mouth of wash emanating; from low hills, probably 

 about one mile west-northwest of "B. M. 418" of Parker quadrangle. 

 U. S. G. S.; March 11 to 12. 



8. Abovt Bill Williams River, Arizona side; camp in river bottom, 

 probably within two miles above "Steamboat Rock" of Parker quad- 

 rangle, U. S. G. S., and hence about eleven miles northwest of the 

 mouth of [Bill] Williams River; March 12 to 15. 



9. Parker, Arizona side ; camp at the new Santa Fe bridge ; this 

 was merely an over-night stop, and very little collecting was done; 

 March 15 to 16. 



10. Riverside Mountain, California side; camp at mouth of wash. 

 close to"B. M. 405" of Parker quadrangle. U. S. G. S. ; March 16 to 22. 



11. 12. Abaci Blythe, California side. The party separated at 

 Riverside Mountain. Stephens and Jones working along slowly on the 

 lookout for beaver sign and making at least two over-night camps on 

 the way to Ehrenberg. One of these stops, and the one by Grinnell 

 and Dixon, were located some distance apart, in the river bottom 

 adjacent to the mesa on the California side, and within six or eight 

 miles above Blythe. March 22 to 24. 



13. Ehrenberg, Arizona side; camp in river bottom within one- 

 fourth mile below the town-, March 24 to 30. 



14, 15, 16. Below Ehrenberg, Arizona side, one station, and near 

 Palo Verde, California side, two stations. The party again separated, 

 and base camps established at three different points in the river bot- 

 tom, estimated to be from ten to twenty-five miles below Ehrenberg. 

 The changed course of the river made dependence upon maps impos- 

 sible. March 28 to April 3. 



17, 18. Opposite Cibola, California side, two stations; main camp on 

 high bank where river swung against mesa ; somewhat above, that is, 

 to the northwest of, rather than directly opposite, Cibola; Stephens 

 and Jones worked from a second station about five miles below the 

 main camp, April 5 to 6. March 31 to April 6. 



19. Ten miles below Cibola, Arizona side; camp on narrow terrace 

 between river and mesa, about a mile below an adobe ruin; April li 

 to 10. 



20. Twenty miles above Picacho, California side-, camp in river 

 bottom opposite Lighthouse Rock, and about a mile below the Draper 

 ranch. In an air line this station was probably somewhat less than 

 twenty miles north of Picacho. April 10 to 17. 



