36 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 



were used at the rate of i gm. of salt to 25 cc. of water (table 2). 

 Pieces of cotton of equal size were wet with tap water and with the 

 three salty solutions, and then they were put on the pieces of card- 

 board, as already described. 



(2) Beetles can distinguisJi differences betzveen zvatcr and sour 

 liquids. — To ascertain whether the above statement is true, three 



Table 5. — Tests to determine whether Mexican bean beetles can distinguish 

 differences betzveen zvater and szveet substances 



Water on cotton (con- 

 trol) 



Cane sugar on cotton . . 



Grape sugar on cotton. 



Saccharine on cotton.. 



Leaves, sprayed with 

 water (control) 



Leaves, sprayed with 

 cane sugar 



Leaves, sprayed with 

 grape sugar 



Leaves, sprayed with 

 saccharine 



Leaves, sprayed with 

 water (control) ... 



Leaves, sprayed with 

 table molasses 



Leaves, sprayed with 

 corn sirup 



Leaves, sprayed with 

 black-strap molasses. 



34 



307 



87 



IS 



141 



254 

 202 



113 

 1 08 



261 



174 

 203 



1.06 : 

 9.60 : 

 2.72 : 

 0.47: 



4.41 : 



7.94- 



6.31 : 



3-53: 



3.38: 



8.16: 



5-44: 

 6.34 



Aug. 29-30 



Sept. 13 



Sept. 16 



32 



32 



sour liquids were used, each of two being prepared at the rate of | cc. 

 of glacial acetic acid (99.5 per cent) or hydrochloric acid (85.9 per 

 cent) to 25 cc. of water, and the third at the rate of 4 cc. of lemon 

 juice to 21 cc. of water (table 3). 



(3) Beetles can distinguish differences betzveen zvater and bitter 

 liquids. — To determine whether the above statement is correct, four 

 bitter liquids were used, each of three being prepared at the rate of 



