PLATE 4 



Fig. 2. Looking up the Colorado River from Mellen, Arizona. At this date, 

 February 27, 1910, the river was at a low stage, leaving many mud bars 

 uncovered. These bars were resorted to as forage grounds by herons and 

 ravens. 



Fig. 3. California shore near Pilot Knob, showing dense mass of cane 

 (Phragmites communis), partly submerged, and in part hanging over the bank 

 into the water. The log held fast by the tangle of cane was the favorite resort 

 of muskrats (Ondatra zibethica pallida), two of these animals being caught 

 at this particular place. This cane is a conspicuous riparian element on per- 

 manent banks from the vicinity of Picacho to the Mexican line. Resident 

 birds showing marked preference for these cane thickets were Melospiza melodia 

 saltonis and Geothlypis trichas scirpicola. Photograph taken May 15, 1910. 



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