SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 69, NO. 8, PL. 13 



Fig. i.— Humid Lower Tropical Zone. An aquatic environment in the lower 

 Chagres Valley near Bohio, Canal Zone. 



Fig 2— Humid Lower Tropical Zone. Typical section of forest interior near 

 Gatun, Canal Zone, exposed by clearing of foreground. 



