MEDITERRANEAN FRUIT FLY IN HAWAII. 



95 



Table XXVI. — Percentage of parasitism among larvae oj the Mediterranean fruit fly 

 emerging during various -periods after the gathering of the host fruit {coffee). 





Date of 



collection 



of fruit. 



Date of 



larval 



emergence. 



Number 

 of pupae 

 yielding 

 aiults or 

 parasites. 



Percentage of parasitism. 



Locality. 



Opius 

 humilis. 



Dia- 

 chasma 

 tryoni. 



Dia- 



chasma 

 fullawayi. 



Total. 



1752 Luso Street, Hono- 

 lulu. 



Booth Estate, Pauoa Val- 

 ley. 



Kealakekua, Kona dis- 

 trict. 



Kainaliu, Kona district.. . 

 Kahaloa, Kona district . .. 



Hookena, Kona district... 



k>ct. 21, 



iDec. 8, 1915 



JDec. 1, 1915 

 June 18,1915 

 Oct. 30,1914 



Oct. 31,1914 



(Oct. 21-23.. 

 •Wet. 23-25.. 

 (Oct. 25-27.. 



f Dec. 8-10... 



Dec. 10-13.. 

 ^Dec. 13-16.. 



Dec. 16-18.. 

 IDec. 18-20.. 



fDec. 1-2.... 



Dec. 2-3.... 

 \ Dec. 3-4.... 



Dec. 4-5.... 

 [Dec. 5-6.... 



f June 18-19.. 

 Uune 19-20.. 

 (June 20-21.. 



fOct. 30- 



Nov. 3. 



{Nov. 3-6... 



Nov. 6-9... 



(Nov. 9-11 . . 



fOct. 31- 



Nov. 3. 



{Nov. 3-6... 



Nov. 6-9... 



IN ov. 9-11.. 



37 

 34 

 52 



256 



338 



609 



258 



76 



5 

 15 



21 

 33 

 46 



46 

 65 

 107 



41 



240 

 125 

 64 



52 



36 

 86 



79 



78.4 

 64.7 

 20.0 







0.3 

 .6 

 

 



40 



86.7 



71.4 



66.6 



54.3 



63 



50.7 



56 



80.4 



23.3 

 3.7 

 



16.7 



17 

 1.2 

 





 

 



0.4 

 .6 

 .1 











60 



13.3 



23.8 



21.2 



13 



30.4 

 41.5 

 32.7 



2.2 



0.4 











40.7 



19 







. 



16.2 

 15 

 5.4 



92.1 

 78.1 

 43.8 

 12.8 

 6.6 





 

 

 

 





 

 









 

 









 

 



94.6 

 79.7 

 25.4 



92.5 



79 



44.5 

 12.8 

 6.6 



100 



100 

 95.2 

 87.8 

 67.3 



93.4 

 92.2 

 88.7 



82.6 



23.7 

 3.7 

 



57.4 



36 

 1.2 

 



Resistance to cold-storage temperatures. — Indications are that Opius 

 humilis can withstand greater cold for longer periods than can its 

 host. Thus 5 O. humilis emerged from 2,500 O. capitata pupae after 

 they had been refrigerated for 9 days at about 26° F. Four lots of 

 1,200 pupae refrigerated at the same temperature for 5, 6, 7, and 8 

 days yielded on removal to normal temperatures 30, 32, 8, and 4 

 Opius. No adult O. capitata emerged from those pupae refrigerated 

 from 5 to 9 days, but from 1,300 pupae, refrigerated at about 26° F. 

 for a period of 4 days, 3 adults emerged along with 40 O. humilis. 



No adult C. capitata emerged from two lots of 1,900 and 4,500 

 pupae refrigerated for 9 and 10 days, respectively, at 32° F., but 7 

 and 13, respectively, of 0. humilis emerged. From 1,228 pupae 

 refrigerated for 18 days at 34° to 36° F. there emerged no adult 

 C. capitata but 2 0. humilis. 



REARING PARASITES. 



In rearing parasites the writers have followed, in the main, the 

 methods employed by the Hawaiian Board of Agriculture and 

 Forestry as developed by Messrs. Silvestri, Fullaway, and Bridwell. 

 The board failed to rear the opiine parasites successfully until Mr. 

 J. C. Bridwell, then assistant superintendent of entomology, altered 



