months old, as many as 70% of the hoppers were stylopized, but 

 the true average must be higher, as many of the unstylopized 

 hoppers would develop parasites later. 



I made every effort to introduce this into Honolulu and sent 

 five cages of stylopized hoppers to Honolulu. Whether they will 

 attack * P. sac'charicida or not remains to be seen. 



Owing to our ignorance of the habits of these insects, especially 

 in the early stage, they were exceedingly difficult to handle. 



A species of Gonatopiis was also found attacking P. zntiensis, 

 especially on the northern, or dry, side of the island. Several 

 consignments of this insect were forwarded, some in cold storage 

 and some in cages on living cane. Although it was nowhere 

 abundant, young hoppers being scarce, yet I hope it will prove 

 of value if once established here. 



These were the only parasites I could find upon P. vitiensis, 

 the predators being somewhat similar to those in the Hawaiian 

 Islands. Spiders of several species, earwigs and ladybirds, pre- 

 dominate. 



Of the ladybirds, Verania strigula was most frequently found 

 in sugar-cane fields, and I forwarded several boxes to Honolulu. 

 In captivity it fed upon young P. zntiensis. Anisorciis affims 

 I never found in cane-fields, but as it is a most useful enemy of 

 scale (Chionaspis), I forwarded several packages. It is not a 

 hardy insect and soon dies in captivity. A large yellow ladybird, 

 Archauvicda tricolor, var. viti'ensis, I also sent, as it ravenously 

 devoured aphis and also a white scale. 



A great deal of time was spent in investigating the cane borer 

 (Sphenophorits obsairiis) to find out what was responsible for 

 its decrease. Thanks to the kindness of Mr. Fenner, of the 

 Colonial Sugar Refining Company, and individual planters on the 

 Rewa, I was enabled to open hundreds of bored stems and stools, 

 but I 'failed to find any parasites on egg, larva, pupa or adult, or 

 to find any reason why this beetle has decreased since Mr. Koebele 

 visited Fiji in 1892. A fungus kills a small number of pupae, but 

 it is rare. The borer is still numerous and in places much worse 

 than I observed it on the plantations most affected on Oahu. 



The introduction of a harder variety of cane is believed, by the 

 majority of Fijian planters, to be the chief reason of the decrease; 

 but if this be so, it took some time to be apparent, as the hard 

 varieties were introduced some time before the borer was noticed 

 to have decreased. With the hard varieties of cane it would 

 take the young larva longer to entirely conceal itself in the cane, 



* As stated below in this Bulletin, it was found that they would not do so. 



