ferred their attacks from native Deliihacids to the cane leaf- 

 hopper. 



The ubiqtiitous lady-l:)ir(l (Cdcciitclla rcl^aiuia) is vahial)le as a 

 destroyer of leaf-hopix-r, though originally imported by Koe- 

 l)ele to destroy Aphis. It is hoped that other lady-birds, es])e- 

 cially rcraiiia sfrii^iila ( = !'. llncola of Vt. \ H) may l)ec(^nK' es- 

 tablished and do good work, as in Australia and l*"iji, wlience 

 I hey were imported. 



The earwig Cliclisoclics morio is a local species, l)ut no doubt 

 useful where it exists in numbers. 



The green cricket {Xiphidiuui I'arif^ciiiic) is ver\- valuable, but 

 is most unfortunatel}' heavily attacked at certain seasons by an 

 egg-parasite. 



The Dryinid Eclitlirodclpha.v fairchildii is locally valuable. At 

 certain seasons in suitable, but limited, localities, it destrows a 

 considerable percentage of hoppers. Its services are under- 

 estimated, because for a large part of the year it lies as a dor- 

 mant larva in the cocoon, and parasitized hoppers at such a time 

 are naturally hardly to be found. 



There are many other natural enemies of uKjre or less im- 

 portance, e. g. the various predaceous Hemiptera, and the sev- 

 eral lace-wing flies (Chrysopinae). 



In addition to these insect enemies, we must mention the two 

 fungous diseases of hoppers (amounting localh- and at certain 

 seasons to epidemics) which, long previously known to kill the 

 native leaf-hoppers, have become transferred to the introduced 

 pest. We also found one or more fungous diseases attacking 

 leaf-hopper eggs in iMJi and Australia in all localities. With 

 material imported from these countries, I easily iniected eggs 

 of the cane leaf-hopper under cover, and subsequently estab- 

 lished the fungus at large in the field. As it was most probable 

 that parasitized and healthy hopper eggs would be afYected 

 alike l)y the disease, and consequently many of the egg-parasites 

 would be destroyed, it became a subject of discussion whether 

 we should attempt to establish the fungus or not. As, however, 

 throughout Australia, the fungus and parasite both attacked 

 the eggs, Mr. Koebele was of opinion that w^c should try and 

 establish the same conditions here. Consequently with the first 

 cages sent to the plantations the cane cuttings and tlu cane 

 itself were well sprayed with water containing spores of the fun- 

 gous disease, so that these would be certainly carried abroad by 

 the emerging hoppers and parasites. I imagine there is no 

 doubt as to this disease becoming established in all suitable 

 localities. 



