54 University of California Publications in Zoology [Vol.12 



time, two of the men traveling separately with the skiff and a light 

 outfit. All members of the party were working from the same base, 

 except where indicated otherwise. The current was depended upon 

 almost altogether to carry our boats from station to station. 



The following enumeration shows the location of the various sta- 

 tions established from the initial point down the river, the names by 

 which they are designated throughout this report, and the time spent 

 ;i1 each. For their location reference should be made to the map 

 (pi. 3). 



1. Needles, California side; camp in river bottom one-fourth mile 

 east of the railroad station ; February 15 to 18. 



2. Five miles below Needles, California side; camp in river bottom 

 in an air line probably slightly less than iowv miles south-southeast 

 of Needles ; February 18 to 23. In this and some other cases, even 

 where a government map was at hand, the exact location on the flood 

 bottom was indeterminable on the map, because of shifting of the river 

 channel ; for it frequently happens that in a single period of high 

 water the topography of the riparian area is profoundly metamor- 

 phosed. 



3. Mellen. Arizona side; camp on narrow mud-bar within one-fourth 

 mile north of the railroad station locally called Topock (=Mellen, on 

 th<- Needles Special Map, U. S. G. S.) ; February 23 to March 1. The 

 Santa Fe railroad crosses the Colorado River at this point. 



4. OpposiU Tin N i idles, California side; camp on high bank about 

 one mile northwest of "B. M. 465" of Needles Special Map, U. S. G. S. ; 

 March 1 to 8. "The Needles" are a group of sharp-peaked hills 

 chiefly on the Arizona side of the river, and must be remembered as 

 a totally distinct locality from "Needles," the name of the railroad 

 town fifteen miles or more to the northwest. 



5. Foot of The Needles, Arizona side; this station was worked from 

 the camp on the opposite side of the river. Certain members of the 

 party rowed back and forth morning and evening to tend trap lines; 

 March 4 to 7. 



6. Chemehuevis Valley, California side; camp in river bottom at 

 lower end of this valley and close to base of hills, probably near 

 "B. M. 438" of Parker quadrangle, U. S. G. S. ; March 8 to 11. With 

 this and the succeeding two stations uncertainty exists as to exact 

 location of our base camps. The maps we had at that time were 

 inaccurate. The Parker quadrangle, U. S. G. S., was not issued until 

 1911. 



