NO. l8 



SENSE ORGANS OF COLEOPTERA McINDOO 



35 



Table 2. — Tests to determine ivhethcr Mexican bean beetles can distinguish 

 differences between ivater and salty liquids 



Water on cottun (con- 

 trol) 106 



Sodium chloride on 

 cotton 13 



Potassium nitrate on 

 cotton 30 



Magnesium sulphate on 

 cotton 56 



3.31 ±0.44 100 



1 

 0.41 ±0.12 0.12 



0. 94 ± o. 28 



0.28 



1.75 ±0.27 I 0.53 



ri6 



Aug. 29-30 



32 



Table 3. — Tests to determine whether Mexican bean beetles can distinguish 

 differences between water and scnir liquids 



Water on cotton (con- 

 trol) j 150 



Acetic acid on cotton. 36 



Hydrochloric acid on 1 



cotton 31 



Lemon juice on cotton. 27 



9.38 ± 1. 12 

 2.25 ±0.61 



1.94 ±0.47 

 1.69 ± 0.44 



Aug. 31 



16 



Table 4. — Tests to determine whether Mexican bean beetles can distinguish 

 differences between zvater and bitter liquids 



