29 



mies of the leaf-hoppar now present in these islands, as above enu- 

 merated ; who considers that ah these were available in these 

 small islands, with their infinitessimally small insect fauna, as 

 compared w ith that of the rest of the world ; who will take the 

 trouble to investig-ate the admirable work done by some of these 

 natural enemies, there can be no doul)t whatever but that an abun- 

 dance of additional enemies can be introduced from other coun- 

 tries. 



r have already in earlier reports stated that good enemies of 

 leaf-hoppers are to be found in certain Australian lady-birds. I 

 have since learnt that Mr. Koebele himself observed such enemies 

 on his former trip to Australia. That many enemies of leaf-hop- 

 per otlier than lady-birds can be found, there is no doubt whatever, 

 some are already well known. 



SUMMARY AND CONCLUSION. 



15. In the foreg'oing' pages I have dealt with the history of the 

 leaf-hopper since its importation into the islands, its probable na- 

 tive home, its efifect on cane and different varieties of cane, its 

 haliits, the various other insects that accompany it, whether in- 

 jurious or otherwise , the impossibility of using" insecticides against 

 it, and the possibility of securing effective natural enemies from 

 other cor.ntries. More especially have I considered the various 

 natural enemies, animal or vegetable, alread)^ present here, and 

 the parasites with which some of these natural enemies are them- 

 selves inrticted. 



The fine work done by some of the natural enemies now pres- 

 ent, added to the fact that as good or better ones can surely 

 be imported from other countries, can leave no doubt whatever in 

 the mind of any entomologist who has investigated the matter, that 

 the leaf-hopper can be so far eliminated by these means as to be- 



