244 Journal New York Entomological Society, t^'o'- >^xii- 



Experiment VI. 



Traps. Hours. Males. 



Kerosene about 120° Be s i6 21 



Gasoline about 63° Be 5 16 13 



Experiment VII. 



Traps. Hours. Males. 



Kerosene about 120° Be 8 18 73 



Benzine about 58° Be 8 18 53 



Experiment VIII. 



Traps. Hours. Males. 



Kerosene about 120° Be 6 16 53 



Distillate about 48° Be 6 16 55 



Experiment IX. 



Traps. Hours. Males. 



Kerosene about 120° Be 4 24 97 



Gasoline about 86° Be 4 H 34 



Benzine about 58° Be 4 24 91 



Experiment X. 



Traps. Hours. Males. 



Gasoline about 86° Be 7 8 15 



Benzine about 58° Be 7 8 53 



It is evident from these experiments that gasoline (about 86° Be.) 

 attracts a smaller niunber of fruit flies than kerosene or benzine 

 (Experiments V, IX, X). Distillate (about 48° Be.) was the only 

 oil which attracted more fruit flies than kerosene (Experiment VIII). 

 The experiment with the distillate and kerosene was carried on for a 

 period of eight hours during two days and the catch for each day 

 may be worth recording. The first day the results were: kerosene 31, 

 distillate 38, a difiference of 7 in favor of the distillate; but the second 

 day the ratio was: kerosene 22, distillate 17, a difiference of 5 in favor 

 of the kerosene. The experiment with the distillate must be repeated, 

 however, in order that definite conclusions may be drawn concerning 

 these oils. 



In the next experiment the oils classed under the Inirning oil 

 distillate were tested in traps which were wired to fruit-bearing mango 

 trees. The traps were shifted about in the trees from time to time 

 but this did not have any marked effect on the number of specimens 



