February, '16] HOWARD: Hawaiian insect introductions 173 



"The Importation into the United States of the Parasites of the 

 Gipsj' Moth and Brown-tail Moth: A Report of Progress with some 

 Consideration of Previous and Concurrent Efforts of this Kind," 

 b> L. O. Howard and W. F. Fiske (Washington, 1911). In this 

 account some space is devoted to the search for parasites of the sugar 

 cane leaf-hoppers in Hawaii, with the final statement that ''The 

 practical results of these importations seem to have been excellent. 

 There seems no doubt that the parasites have been the controlling 

 factor in the reduction of the leaf -hoppers." 



The latest to be published is the chapter entitled "Die biologische 

 Bekiimpfung," in K. Escherich's book, "Die angewandte Entomologie 

 in den Vereinigten Staaten," published by Paul Parey in Berlin, 1913; 

 but in this account the Hawaiian work is not mentioned. 



The Hawaiians themselves have not bragged about their achieve- 

 ments. They have published bare statements of facts with technical 

 descriptions of imported species, but have shown themselves ag- 

 grieved by statements made by Froggatt in his account of his journey 

 around the world during which he spent a month on the islands and 

 they have published, as just indicated, a translation of a large, part 

 of Silvestri's commendatory paper. Recently, however, they have 

 seemed to be more inclined to tell the world exactly what they have 

 done and to welcome the favorable and even enthusiastic comment 

 which must necessarily follow a widespread knowledge of their achieve- 

 ments. Mr. O. H. Swezey, for example, in an excellent, straight- 

 forward, and at the same time modest paper which he read before the 

 meeting of the Association of Economic Entomologists at Berkeley, 

 California, during the first week of last August (published in the Jour- 

 nal OF Economic Entomology, Vol. 8, No. 5, October, 1915), has 

 put the entomologists of the world in possession of many new facts 

 which were unknown to them before. 



But still, enough has not yet been said, and the writer satisfied 

 himself by a visit during August, last, to Oahu, by observation, and 

 by interviews with the scientific men of the island and with the prac- 

 tical men of affairs, that Hawaii has seen a most extraordinary series 

 of successful experiments in the introduction of beneficial insects 

 which has in toto far excelled anything of the kind that has been 

 done elsewhere in the world and which has resulted in an immense 

 monetary saving. There can be no doubt of it. 



The Sugar Cane Leaf-Hopper and its Imported Parasites 



The sugar cane leaf-hopper of Hawaii {Perkinsiella saccharicida 

 Kirkaldy) appears to have been introduced with seed from Australia 

 about 1898. 



