67 



Several cocoons wliicli I uiiearrhcd Api'il and hroniilit to the 

 Ex})crinicnT Station yieldod adults in the first week of Mixy. 



The wasp does its share in destrDving leafhoppers ; while 

 immensely less nnmerons than the cane pest, it is nevertheless 

 ahnndant in some fields, where one female mav capttire 100 or 

 nioi'e hoppers for provisioniiiii' her nest. In a twelve-celled 

 nest (i,-) cane leafho})j»ers wei'c counted, and as ihi< Imrrow 

 contained thi-ee eocooiis and one or two other cells in which 

 ihe provender had heen lari>-el_v consnnied, it is cpiite safe to 

 estimate the nnniber oi PcrlrinsicJId supplied here as exceeding 

 100. 



liut will 



Fig. 3. Piii)a of Xcsoiniincsa hawaiionsis. 



lie XcsoiiiiiiK'sd has beneficial habits, it does not 

 Work in fidl harmony with th(^ Pipunculus fiy heretofore men- 

 tioned. He it noted that (if the O") hoppers stored by one wasp, 

 1.^ <d' these were already parasitized by Fipunculas. This is 

 a far higher per cent, of Pipunculus parasitism (23 /4) than 

 existed in the adjacent cane field, from which Nesomunesa 

 very probably caught her jirey, (4.09%). Some of the fiy 

 luaagots in the cells were ;di\c in the ho]i]ters. and others 

 still. bi-oughl in thronuh the medium of their host, Avere sutfi- 

 cieiitlx- fai' advanced iii develo])ment as to be able to jiupale. 

 Four |M|Miiiculaled liojipers secured from a was]i's nest failed 

 to produce ])U|)aria. and though I'iptiiiciilus sometimes do 

 hatch in the celU. it is doubtful if they can work their way 

 cntii-elv out of their earthen prison. Possiblv the mon^ slui:- 

 gish behavior of I ' i pmintJ iis-\)HYasit\zcd hoppers in tlu' field 

 permits of their being captured with greater case and therefore 

 fre(piencv bv the was]^ than their more healthv brethren. 



.\llhouiih lhi> was]) woi-ks best during the sunduue il will 



