67 



Several cocoons which I unearthed April 6 and brought to the 

 Experiment Station yielded adults in the first week of Ma\. 



The wasp does its share in destroying leafhoppers; while 

 immensely less numerous than the cane pest, it is nevertheless 

 abundant in some fields, where one female may capture 100 or 

 more hoppers for provisioning her nest. In a twelve-celled 

 nest 05 cane leafhoppers were counted, and as this burrow 

 contained three cocoons and one or two other colls in which 

 the provender had been largely consumed, it is (piite safe to 

 estimate the number of Perhinsiella su})plied here as exceeding 

 100. 



Fig. 3. Pupa of Xesomimesa hawaiiensis. 



But while Xcsoniuncsa has l)eneficial habits, it does not 

 work in-full harmony with the Pipuiiculus fly heretofore men- 

 tioned. Be it noted that of the 65 hoppers stored by one wasp, 

 15 of these were already parasitized by Pipunculus. This is 

 a far higher per cent, of Pipunculus parasitism {2'3%) than 

 existed in the adjacent cane field, from which Nesomimesa 

 very probably caught her prey, (4.09%). Some of the fly 

 maggots in the cells were alive in the lioppers. and others 

 still, brought in through the medium of their host, were suffi- 

 ciently far advanced in development as to be able to pupate. 

 Four pipunculated hoppers secured from a wasp's nest failed 

 to produce puparia, and though Pipunculus sometimes do 

 hatch in the cells, it is doubtful if they can work their way 

 entirely out of their earthen prison. Possiblv the more slug- 

 gish behavior of Pipunculus-^&rsLsitized hoppers in the field 

 permits of their being captured with greater ease and therefore 

 frequency by the wasp than their more healthv brethren. 



Although this was]^ works best during the sunshine it will 



