242 JouRXAL New York Entomological Society. tVoi. xxii. 



in all of the following experiments, we refer the reader to a previous 

 paper (1912, p. 403). 



In the first experiment four traps containing either kerosene, fish. 

 whale or citronella oil were wired at the same height in a single large 

 Waialua orange tree (Citrus aurantimn sincnsc) represented in the 

 diagram by a circle with the letters k, f, w, and c (Diagram, A). In 

 this same experiment four lemon trees (Citrus medica Umonum) 

 closely clustered together were each provided with a trap containing 

 one of the above oils (Diagram, B). In each of two navel orange 

 trees (Citrus auratiiium) situated at some distance from each other, 

 two traps were fastened containing either kerosene or whale oil and 

 citronella or fish oil (Diagram, CC). Lastly, four traps each of 

 which contained one of the four oils, were put in four navel orange 

 trees situated in different sections of the orchard (Diagram, DDDD). 

 The following figures indicate the results of a three days' catch iii 

 each oil trap: 



Experiment I. 



One Waialua Four Two Navel Four Navel Total 



Trees. Orange. Lemon. Orange, Orange. Males. 



Kerosene 123 42 26 70 261 



Citronella oil o 3 o i 4 



Whale oil o o o o 



Fish oil o o o o 



As there still was a possibility that the volatile parts of the dif- 

 ferent oils had interfered with one another in the above experiment, 

 it was decided to test out each oil separately in another orchard. A 

 trap containing citronella oil was wired in each of three guava trees 

 (Psidium guayava pomifcruni), one tropical almond (Tcrminalia 

 cattapa), one bread fruit (Artocarpus incisa) and one lime tree 

 (Citrus medica limctta) . This experiment was continued for a week, 

 at the end of which time the traps were replaced with a clean set 

 containing whale oil. The whale oil was tested out in the same 

 trees for nine days, then the fish oil was substituted for fourteen days 

 and finally kerosene for one day. The results in this experiment were 

 as follows: 



Experiment II. 

 Traps, Days. Males. 



Citronella oil 6 7 49 



Whale oil 6 9 o 



Fish oil 6 14 2, 2 females. 



Kerosene 6 i 138 



