182 



DWIGHT E. MINNTCH 



2. Experiments on Pyrameis 



In experimenting with Pyrameis, specimens were first tested 

 in position 1, then in position 2, and finally in position 3 (fig. 

 1, 1, 2, 3). The trials in the three positions were not made in 

 immediate succession, however, but separated by a minimal 

 interval of fifteen minutes. Two experiments, composed of 

 three sets of trials each, were carried out. The total number 

 of butterflies employed was eight. In both experiments the 

 specimens were collected in the field. In experiment 1 the 



TABLE 1 

 Pyrameis 



animals were collected in the evening and tested the following 

 morning; in experiment 2 they were collected and tested in the 

 same morning. The results of these experiments are presented 

 in table 1 and figure 2. 



It will be noted (table 1) that while only 29 per cent of the 

 butterflies responded in position 1 and but 17 per cent in position 

 2, 100 per cent responded in position 3. Several facts are brought 

 out clearly by these data. Pyrameis does respond to the dis- 

 tance stimuli afforded by applejuice in a number of cases. The 

 number of these responses is not increased by bringing the second 

 tarsi in contact with distilled water. But if the second tarsi 



