LOCOMOTIONS OF SURFACE-FEEDING CATERPILLARS. 1 45 



havior in all cases was similar. They moved at random about 

 the maze; roaming into blind alleys and out again, often retracing 

 their steps when in the right pathway, and frequently pausing 

 to make exploring movements. The rays of light were crossed 



FIG. 3. 



at every possible angle. When a gentle breeze was blowing, 

 there was not the slightest indication of an anemotropism. 

 There was one striking uniformity. Whenever a caterpillar 

 came in contact with incline for the first time, it practically in- 

 variably ascended it. 1 This happened when the contact was 

 made where the edges of the maze and incline came in contact, 

 and also when the exploring movements of the insect brought 

 it in contact with some portion of the incline that was higher 

 than the maze. After once mounting the incline the caterpillar 



1 Only twice during the summer, did a caterpillar descend the incline upon its 

 first contact with it. 



