446 



N. E. MCINDOO. 



Species. 



Experiment and Behavior of 

 Insects Tested. 



Average Length 

 of Life in 

 Captivity. 



Days. 



Leptinotarsa 

 I o-lineata. 



Epicauta 

 marginata. 



Epicauta 



pennsylvanica. 



Unmutilated. Normal in be- 

 havior 



Antennae pulled off. Normal in 

 behavior 



Elytra pulled off and wings cut 

 off. Normal in behavior. . . 



Elytra pulled off, bases of wings 

 glued and pores on legs 

 covered with vaseline. Nor- 

 mal in behavior 



Unmutilated. Normal in be- 

 havior 



Antennae cut off. Considerably 

 abnormal in behavior 



Antennae pulled off. Slightly 

 abnormal in behavior 



Elytra and wings pulled off. 

 Slightly abnormal in behavior 



Unmutilated. Normal in be- 

 havior 



Antennae pulled off. Slightly 

 abnormal in behavior 



Elytra and wings pulled off. 

 Normal in behavior 



69.0-1- 



38.0 



52.0-1- 



61.0 + 



27.6 

 3-4 



5-5 

 8.0 



II. 2 



8.7 

 10.7 



A summary of the preceding table shows the following: After 

 the antennae were pulled off, four of the 11 species tested were 

 normal and seven were slightly abnormal in behavior. After 

 the elytra and wings were pulled off one species was normal while 

 four were slightly abnormal in behavior. After the elytra were 

 pulled off and the wings were cut off, the one species tested was 

 normal in behavior. After the elytra and wings were pulled off 

 and the pores on the legs were covered with vaseline, the one 

 species tested was slightly abnormal in behavior. After the 

 elytra were pulled off, the bases of the wings glued and the pores 

 on the legs covered with vaseline, the one species tested was 

 normal in behavior. 



Four unmutilated species responded to odors more slowly than 

 did the same species after the antennee had been pulled off. This 

 is explained by the fact that most beetles are more or less " timid " 



