RELATION OF INSECTS TO THE PARASITIC WORMS 87 



I so pt era — termites 



Hodotermes pretoriensis Fuller 

 Filaria aallinarum 



Odonata — dragonflies 



Aeschna sp. 



Prosotocus confusus 



Agrion sp. 



Gorgodera pagenstecTieri 

 Gorgodera varsoviensis 

 Pleurogenes medians 



Calopteryx virgo (Linnaeus) 

 Halipegus ovocaudatus 

 Pneumonoeces similis 



Cordulia sp. 



Prosotocus confusus 



Epitheca spp. 



Gorgodera cygnoides 

 Gorgodera pagenstecheri 

 Gorgodera varsoviensis 



Plectoptera — mayflies 



Cloeon dipterum (Linnaeus) Stephens 

 ? Opisthioglyphe rastellus 



Ephemera vulgata Linnaeus 

 Allocreadium isoporum 

 Filaria ephemeridarum 

 ? Opisthioglyphe rastellus 



Ephemeridae 



Lecithodendrium ascidia 



Oligoneuria rhenana ImhofF 

 Filaria ephemeridarum 



