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All such plants and fruits infested with insects or fungi not 

 known to exist on these Islands are immediately destroyed. 

 Plants that are infested with a species of insect already es- 

 tablished here are fumigated with hydrocyanic acid gas. 

 This gas is used at a strength that does not injure the plants, 

 but kills all insect life upon them. The object of killing such 

 Insects is to prevent the infusion of new blood and vigor into 

 those pests already here. 



//. Search for and Distribution of Beneficial Insects. 



Prof. Albert Koebele has virtvially saved the vegetation of 

 this Territory from disfigurement and utter destruction by 

 means of the numerous lady birds and other beneficial in- 

 sects which he has introduced from all parts of the world 

 in the course of the past twelve years. This is a kind of ento- 

 mological work of which only the State of California and 

 the Territory of Hawaii have made a specialty. The almost 

 clean and healthy condition of our trees and shrubs at pres- 

 ent, in comparison with what it was before Mr. Koebele 's 

 coming, is sufficient testimony to the good work he has done. 

 The services of Prof. Koebele are still at the disposal of the 

 Territory. His mission is to travel in foreign lands, search 

 for enemies of our injurious insects, and introduce them into 

 the Territory. Moreover, he being the "Kamaaina" of the 

 Division, his knowledge of the Hawaiian insects is of great 

 value to the Division and the Territory. 



///. Breeding and Distribution of Beneficial Insects. 



A good deal of the work of this laboratory consists in the 

 breeding and distribution of useful insects. Various lady- 

 birds and minute four-winged flies are engaged in the good 

 work of checking the rapid increase of scale insects, plant 

 lice and other insect pests. As neither the "good" nor the 

 "bad" insects are at all times equally distributed over the 

 Islands, it is the business of the Division of Entomology to 

 supply the "good" ones wherever they are needed. For this 

 purpose a constant supply of some of this class of insects is 

 kept in breeding jars and cages. Others again are collected 

 outdoors and sent to correspondents. 



