109 

 Natural Enemies. 



Natural enemies of the fern weevil were unknown until the 

 recent investigations of Mr. C. E. Pemberton, field entomologist 

 on the staff of the Hawaiian Sugar Planters' Experiment Sta- 

 tion, in Australia (made subsequent to the preparation of this 

 bulletin) disclosed a hymenopterous insect — referred to the genus 

 Doryctes (Bracpnidse) — parasitic in its larval stage upon the 

 larva of the weevil, and exercising a decided check on its depre- 

 dations in the forests of northern New South Wales. This in- 

 sect has been sent to Hawaii in numbers and liberated in the lo- 

 cahties where the fern weevil prevails. If its establishment suc- 

 ceeds from these liberations it may prove of great benefit, as the 

 forests would unquestionably be damaged by the fern weevil's des- 

 truction of the largest component of their under-cover. 



In endeavoring to multiply the Australian parasite under arti- 

 ficial conditions at Honolulu, another hymenopterous insect has 

 been reared from the fern weevil, namely, Ischiogonus palliatus. 

 This insect has been known in Hawaii for many years as an 

 enemy of Cerambycid and Curculionid beetles. 



In connection with the subject of natural enemies, it should 

 be mentioned that the beetles are destroyed to some extent by a 

 parasitic fungus. 



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longing to the Curculionidae. Ann. Nat. Hist. (7) xi, p. 229-230. 

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