May, 1918] 



Parasites of Leaf-IIoppers 



245 



By far the greatest number of host records today in the 

 family Fidgoridce are in the sub-families DelphacincD and FlatincB, 

 the highest specialized groups of this family. Ten genera in 

 each of these are paratitized, while but one or two genera are 

 parasitized in the Issince, AcanaloniincB, Tropidiichince, CixiincB, 

 and Dictyophorince. No species in the others are at present known 

 to be dryinized. Only the highest specialized genera in the 

 AnteonifKB parasitize this group, thus suggesting that as a 

 group they were first parasitic on the Cicadellidce, later becom- 

 ing adapted for parasitizing the FiilgoridcB. Most of the species 

 are subject to parasitism in their immature stages, the adults 

 apparently being free, except in the less active, smaller, and 

 short-winged forms as Libiirnia. 



Apterous species with both arms of chela 

 lamellate, hosts Fulgoridae, sexual dimorphism 

 marked. Pseudogonatopus type. , '• 



Winged species with both arms of 

 chela lamellate, hosts Fulgoridfe, sex-_ 

 ual dimorphism marked. Echthrodel- 

 phax type. 



Winged species with one arm of 

 chela lamellate, hosts Cicadellidae, > 

 sexual dimorphism, Chelothelius type. 



Winged species, chela in some spe- 

 cies only partly extensile, hosts ^ 

 Cicadellidae, sexual dimorphism but 

 not extreme. Chelogynus type. 



Winged species, no chela, hosts 

 Cicadellidae and Membracidae, no> 

 sexual dimorphism. Aphelopus type. 



Apterous species with one arm of 

 chela lamellaite, hosts Cicadellidae, 

 sexual dimorphism marked. Gonato- 

 pus type. 



Winged or partly apterous species, 

 lateral arm of chela serrate, median 

 arm bare, hosts Fulgoridae, sexual 

 dimorphism. Phorbas type. 



Winged species, chela fairly special- 

 ized and freely extensile, hosts Cica- 

 'dellidae, sexual dimorphism. Deino- 

 dryinus type. 



Winged species, chela in some 

 /species not extensile, hosts Cicadel- 

 ^ lidae. Anteon type. 



Primitive Dryinid 



