496 
Psyche 
[December 
Figure 1. Stepped histograms showing, in a simplified and condensed 
form, the results of the experiments in which Nephila clampes and Argiope 
argentata were presented with a succession of small prey. Details of the 
experiment are given in the text. The basal histogram (3) of each block 
shows the percentage of prey passing through the webs. The center histo- 
gram (2) shows the percentage escaping after hitting the web, and the be- 
havior of the spider at the time the prey escaped. The top histogram (1) 
of each block shows the percentage of prey captured (reading from 100% by 
subtraction). In the case of Nephila some prey were lost after capture and 
these are shown in the lower part of the capture column. Number of prey 
presented to each species: 200. 
