Table 2. Some popluation parameters of cicada species in the ravine forest, “Cuesta Angel”, Costa Rica 
1980] 
189 
Young — Ecology of Cicadas 
S P- 18 mm 9 3 0.002/ m 2 23 8 0.060/ m 2 0.005/ m 2 
*There are four river-edge plots of these sizes: 2,145m 2 , 1,350m 2 , 462m 2 , and 3,000m 2 for total area of 6,957m 2 . 
* All estimates of density based on occupied plots only: no empty plots included. 
*Most of these plots are 25m 2 for a total area of 484m 2 . 
