394 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 54. 



ONCOMETOPIA UNDATA Fabricias. 



Mr. George D. Smith collected at Thomasville, Georgia, a female 

 containing two female Dacyrtocara imdata, one behind the fourth 

 ventral and the other behind the fifth lateral plate. The leaf hop- 

 per died in captivity May 10, 1915, and was immediately placed in 

 alcohol. The two parasites completely filled the abdomen, having 

 absolutely emptied and destroyed the intestines, reproductive organs, 

 and all other abdominal organs. 



STENOCRANUS SACCHARIVORUS Westwood. 



At Eio Piedras, Porto Kico, in November, 1913, Mr. T. H. Jones 

 collected a large number of sugar-cane leaf hoppers, Stenocranus 

 saccharivorus, abundantly parasitized by Stenocranophilus giiadratus 

 Pierce. A total of 150 leaf hoppers were obtained. On these leaf 

 hoppers the following data were made, as tabulated : 



Unpara- Para- 

 Leaf hoppers, sitized. sitized. 



71 male 50 21 



79 female 49 30 



150 99 51 



47.3 per cent of the leaf hoppers were males, 52.7 per cent females. 



41.1 per cent of the parasitized leaf hopper? were males, 58.9 per cent 

 females. 



70.4 per cent of the male leaf hoppers were unparasitized, 29.6 per cent 

 parasitized. 



62 per cent of the female leaf hoppers were unpai'asitized, 38 per cent parasi- 

 tized. 

 66 per cent of the leaf hoppers were unparasitized, 34 per cent parasitized. 



The following data give more specifically the extent of parasitism 

 found in these leaf hoppers, bringing out the percentage of sexes of 

 the parasites and their relations to each other. 



1 male leaf hopper with 2 male parasites *= 2 parasites. 



11 male leaf hoppers with 1 male parasite =11 parasites. 



12 male leaf hoppers with 13 male parasites. 



3 female leaf hoppers with 2 male parasites= 6 parasites. 



13 female leaf hoppers with 1 male parasite =13 parasites. 



16 female leaf hoppers with 19 male parasites. 



28 leaf hoppers with 32 male parasites. 



2 male leaf hoppers with 2 female para.sites= 4 parasites. 

 4 male leaf hoppers^ with 1 female parasite= 4 para.sites. 



G male leaf hoppers with 8 female parasites. 



1 This stenocranus also contained 1 dryinid puparlum. 

 - One of these also contained a dryinid puparium. 



