08 



industrially bring in hoppers in cloudy weather and even 

 as I once observed, during a light rain. 



During November I had occasion to visit the AVood Valley 

 region again. The cane leafhopper had disappeared and 

 Nesomiiiicsd 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 helds. 



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 supply for her young than is furnished by Perkin- 

 siella. tlu^ cane pest. 



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

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



Some Observations on Pipunculus Flies" Which Parasitize the 



Cane Leafhopper, at Pahala, Hawaii, 



Feb. 11-April 25, 1918. 



BV F. X. WILLIAMS. 



Fig. I. Pipunculus sp. 



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

 wasp Nesomimesa liawaiierms, has largely transferred its atten- 



* Three species of Pif^uiici(his were taken at Pahala; P. juiator Per- 

 kins, P. hawLiiictisis Perkins and an undescribed species. 



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



