38 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 62 



tributes of taste. They " disliked " water containing salts, acids, 

 bitter materials, and saccharine, but " liked " the other sweet sub- 

 stances, including cane sugar, grape sugar, table molasses, corn 

 sirup, and black-strap molasses, and even showed preference between 

 them. To the writer the saccharine solution was sweetest, but dis- 

 tasteful ; the cane sugar, less sweet, and tasteful ; and the grape sugar, 

 least sweet, and less tasteful. The beetles showed " dislikes " and 



Table 7. — Tests to determine zvhether bean foliage sprayed zvith arsenicals, 

 is repellent to Mexican bean beetles 



73 •£ 



s m ^ 



C OJ "> 





Unsprayed (control) 



Calcium arsenate . . . 



Magnesium arsenate . 



Lead arsenate 



Unsprayed (control). 



Calcium arsenate . . . 



Magnesium arsenate . 



Lead arsenate 



Unsprayed (control). 



Calcium arsenate . . . 



Magnesium arsenate. 



Lead arsenate 



Summary of above: 

 Leaves, unsprayed 

 (controls) 



Calcium arsenate . . . 



Magnesium arsenate. 



Lead arsenate 



191 

 160 

 177 

 III 



275 

 177 

 122 

 122 

 172 



159 

 104 



lOI 



638 

 496 

 403 

 334 



0.49 

 0.62 

 0.56 

 0.40 

 0.67 

 0.50 

 0.42 

 0.48 

 0.46 



0.35 

 0.25 

 0.22 



6.64 ±0.33 

 5.17 ±0.29 

 4.20 it 0.26 

 3 . 48 ± 0. 22 



1. 00 

 0.84 

 0.93 

 0.58 

 1. 00 

 0.64 

 0.44 

 0.44 

 1. 00 

 0.92 

 0.60 

 0.59 



I. GO 

 0.78 

 0.63 



0.52 



17 



ri7 



24 



Sept. 3 



Sept. 4 



Sept. 27 



32 



32 



2>2 



above 

 96 



" likes " in somewhat the same order. To the writer the picric-acid 

 solution was most bitter, the quinine less bitter, and the strychnine 

 least bitter. The insects " disliked " these solutions in about the same 

 order. To the writer the solutions containing acetic acid and hy- 

 drochloric acid had practically the same degree of sourness, while the 

 diluted lemon juice was sourer. The beetles also showed only slight 

 differences between them. In regard to the salty solutions, the writer 

 disliked only the magnesium sulphate solution, but the beetles pre- 

 ferred it to the other two. 



