150 



TETRASTICHUS GIFFARDf 

 Oahu 



Nuuanu 12,300 



Manoa 950 



Moanaliia 1,000 



Pearl City 200 14,450 



Hawaii 



Kona 1,800 



Hilo 1,000 2,800 



Kauai 



Lihue 800 800 



Total 18,050 



DIACHASMA FULLAWAYI 



Oahu 



Maunawili 35 



Hawaii 



Kona 160 195 



Total 195 



The present purpose is to continue multiplying tliese para- 

 sites similarly to the others, until we can ascertain that they are 

 established in nature. In August of 1914 the Australian Opius 

 (Diachasma tryoni) which was liberated in Kona at the same 

 time as the South African species, was also recovered and is now 

 kno\^ai to be well established all through the coffee fields of that 

 district. We are endeavoring to multiply it in the insectary from 

 specimens brought from Kona by Dr. Back, in order to establish 

 it on Oahu and eventually on all of the other Islands. 



The great reduction of flies Avhich has been brought about by 

 the parasitism of these species is alread^^ being noticed by even 

 the casual observer. The depletion in numbers is naturally much 

 more marked in Kona, where the fly had unusual opportunities to 

 increase before the introduction and establishment of the para- 

 sites. Dr. Back, on a recent visit to Kona, was so impressed by 

 the altered condition that he set to work to secure data on the 

 extent of the parasitism, both in Kona and in Honolulu, and I 

 am indebted to him for the opportunity of presenting the append- 

 ed table showing the percentages of parasitism in the two dis- 

 tricts, in different fruits arid in large and small quantities of each 

 fruit. It will be noticed that some of the lots produced as high as 

 50 per cent of parasitism from one species, though the average 

 out of all kinds of fruit is only about 15 per cent. In Kona the 

 parasitism is even somewhat higher. 



It is particularly gratifying to those who planned and carried 



