Bui. 63, U S. Dept of Agriculture. 



Plate IX. 



I- LJ 



05 CQ 



Z 



< o 



C3 t- 

 < 



LLl IJJ 



5 o 



O -1 

 < < 



in 



I 



UJ H 



^-■g 



I- Z 



X UJ 

 (- X 



H 



O ^ 



Q < 



u O 



S < 



