08 



industrially bring in hoppers in cloudy weather and even 

 as I once observed, during a light rain. 



During Xovember I had occasion to visit the Wood Valley 

 region again. The cane leafhopper had disappeared and 

 Nesomimesa was pursuing her vocation higher up among the 

 shrubbery of the native forest which flourished at an eleva- 

 tion of several hundreds of feet above the cane fields. 



Thus it seems that this wasp which is really a forest in- 

 sect, may from time to time be compelled to fall back on 

 native leafhoppers as a sparser though more dependable source 

 of food su])ply for her young than is furnished by PerJ/in- 

 sieUa. the cane pest. 



The figures are the work of Mr. W. E. R. Potter, illusra- 

 tor for the IT. S. P. A. Experiment Station. 



Some Observations on Pipunculus Flies* Which Parasitize the 



Cane Leafhopper, at Pahala, Hawaii, 



Feb. 11-April 25, 1918. 



BY F. X. WILLIAMS. 



Pipunculus sp. 



This is a rather small blackish fly (Fig. 1) which like the 

 wasp Nesomimesa haivaiiensis, has largely transferred its atten- 



* Three species of Pifiiiiciihis were taken at Pahala; P. juvator Per- 

 kins. P. hawaiicnsis Perkins and an undescrihed species. 



Proc. Haw. Ent. Soc. IV. Xo. i. June, 1919. 



