NO. l8 



SENSE ORGANS OF COLEOPTERA — McINDOO 



35 



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

 differences betiveen zvater and salty liquids 



Water on cotton (con- 

 trol) 106 



Sodium chloride on 



cotton 13 



Potassium nitrate on 

 1 

 cotton 30 



Magnesium sulphate on j 



cotton I 56 



3.31 ±0.44 

 0.41 ± 0.12 

 . 94 ± 0. 28 

 1.75 ±0.27 



Aug. 29-30 



32 



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

 differences betzveen zvater and sour liquids 





E-5 



C il C 

 ^.Q o 



H ti 

 o o o 



Water on cotton (con- 

 trol) 



Acetic acid on cotton. 



Hydrochloric acid on 

 cotton 



Lemon juice on cotton. 



150 

 36 



31 



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 distingidsh 

 differences betzveen zvater and bitter liquids 



Water on cotton (con- 

 trol) 



Strychnine on cotton. 



Quinine on cotton. . . . 



Picric acid on cotton. 



Leaves, sprayed with 

 water (control) . . 



Leaves, sprayed with 

 beetle extract 



171 

 102 



83 



46 



198 

 172 



10.69 — 0-84 

 6.38 ±0.78 

 5.19^0.72 

 2.88 ±0.26 



6.19 ±0.29 

 S.38±o.39 



Aug. 16 



Sept. 14 



16 



32 



