April, 1918] 



Parasites of Leaf-IIoppers 



191 



Twenty-two genera, including forty-nine known species and 

 five unidentified ones out of three of the six sub-families in the 

 Cicadellidcc are known to be parasitized by the dryinids. Most 

 of the host records are in the sub-family Jassince chiefly grass 

 living forms. In the Fnlgorida:, twenty-six genera, including 

 twenty-two species and four unidentified species are known to 

 be subject to parasitism by these insects. In this family most 

 of the host records are in the sub-family Delphacince. In all 

 fulgorids the nymphal stages are the most susceptible to attack, 

 the only adults parasitized being the weaker and less active 

 forms. It is likeh' that nearly every species in these two families 

 is subject to attack by one or more species. 



CICAOIDAC ICICAPtULIOAll IFULGOHIOAtl CCRCOPIOAt It'EKBHACIDAil 



lULOPfflDAt PLATYQASTRIDAE MYMARIDAI TBICHOORAMIIIDAt lAWTCOMIWAtl PIPUHCUtlDAi STREPSIPTCRA tPtPYMPtOAE' 



OTHER PARASITIC 

 NYMINOPTIR 



eORROOCNTIA LIPmOPTtRA 



COLtOPTERA 



OITTHOPTERA 



DIPTERA 



HY«EMOPTE»A 

 NON PARASITIC 



Diagram 1. 

 Interrelations of Anteonince with other parasites. 



The above diagram represents graphically the inter-relations 

 of the Anteonince and their hosts with other related parasites 

 of these hosts. It is seen at once how small a part they play 

 as a group in comparison with the other parasites in maintaining 

 nature's balance. They are but one link in a very complex 

 series. The leaf hoppers are parasitized also by the Eulophidce, 

 PlatygastridcE, Mymaridce, Trichogrammidce , Chalcididce, and 

 Encyrtidce of the Hymenopiera, by the Pipunculidce of the 

 Diptera, by the Epipyropidce of the Lepidoptera, and by the 



