Fig. 21. — ^Shallow, stony rapids, 

 etc. Location E, figure. 16. 



TItb iiome of Coryclalis cornutus larvae, 



Fig. 22. — Dried plants of MeUlotus alba, having become established upon the 

 gravel bar during the previous year. I'his is one of the most important 

 pioneers in revegetation of such areas. Location P, figure 16. 



