next two or three days several young hoppers hatched out. The 

 day before arriving at Honolulu I stripped the few remaining 

 leaves off the cane and found two more young hoppers. 



My work in Fiji was greatly facilitated by the kindness of 

 Mr. F. W. Fenner, Manager of the Colonial Sugar Refining Com- 

 pany, Nausori, Mr. Fordham Jonson of the Vancouver Fiji Sugar 

 Company, and members of the Fijian Planters' Association, es- 

 pecially Mr. J. L. Hunt, of Koronoveh, in whose fields I did most 

 of my collecting. Mr. Duncan, Alanager of the Canadian- 

 Australian S. S. Mail Co., kindly gave me every facility for ship- 

 ping insects to Honolulu. 



NOTES ON STYLOPID AND DIPTEROUS PARASITES 



IN FIJI. 



(0 ELENCHUS TENUICORNIS. 



This insect I found in Fiji parasitic upon the Vitian cane leaf 

 hopper {Perkinsiella vitiensis) and several other species of Del- 

 phacids. Its economic value I estimated highly, as a large per- 

 centage of young and adult leaf hoppers were stylopized. I 

 therefore made great efforts to introduce it, hoping that, as its 

 hosts were so varied, it would attach itself to the Hawaiian cane 

 leaf hopper {P. saccharicida). This hope was not fulfilled, as 

 P. saccharicida proved immune from the attacks of Elcnchus. 

 Two or thre^ generations of Elcnchus were reared upon P. 

 vitiensis in cages containing also- P. saccharicida, and stylopized 

 Aloha iponiocac were enclosed with the latter, but these never 

 developed parasites. Eventually I dissected a great number of 

 P. saccharicida, that died in the breeding cages, and in two I found 

 single specimens of triungulins that had never developed. This 

 indicates that a great pathological difiference exists between P. 

 saccharicida and P. vitiensis, a difference thkt would not be ex- 

 pected from the similarity of their external characters. Mr. 

 G. W. Kirkaldy, however, informs me that the males of these leaf- 

 hoppers differ greatly in the form of their genitalia. 



As it was necessary', when in Fiji, to get together as large 

 colonics as possible for shipping to Honolulu, I could not destroy 

 living hoppers for dissection and follow the larval changes as 

 closely as I wished. 



Upon my return to Honolulu I was informed by Mr. W. M. 

 Giffard, that he had discovered E. temUcornis, parasitic upon 

 Aloha iponiocac, at an elevation of 1300 feet on Mount Tantalus. 

 Pic kindly procured me some fresh specimens, which enabled me 

 to verify several points in the economy of these little insects. 



