RELATION OF INSECTS TO THE PARASITIC WORMS 87 



Isoptera — termites 



Hodotermes pretoriensis Fuller 

 Filaria aallinaritm 



Odonata — dragonilies 



Aeschna sp. 



Prosotocus confusus 



Agrion sp. 



Gorgodera pagenstecheri 

 Gorgodera varsoviensis 

 Pleuro'genes mediams 



Calopteryx virgo (Linnaeus) 

 Halipegus ovocavdatus 

 Pnetimonoeces similis 



Cordulia sp. 



Prosotocus confusus 



Epitheca spp. 



Gorgodera cygnoides 

 Gorgodera pagenstecheri 

 Gorgodera varsoviensis 



Plec t opt era — ^mayflies 



Qoeon dipterura (Linnaeus) Stephens 

 ? Opisthioglyphe rastellus 



Ephemera vulgata Linnaeus 

 Allocreadium isoporum 

 Filaria ephemeridarum 

 ? Opisthioglyphe rastellus 



Ephemeridae 



Lecithodendrium ascidia 



Oligoneuria rhenana Imhoff 

 Filaria ephemeridarum 



