
AQUATIC INSECTS OF FRESHWATER 
Of these Anopheles bear the Plasmodium malarie which produces malaria] 
fever, Culex pipiens those of Roman fever, Stegomyia fasciata those of yellow 
ie 

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FIG. 219. Malaria Mosquitos, Anopheles quadrimaculatus. Adult male and female. Greatly enlarged. 
fever, and Culex ciliaris the parasitic Filarias which produce elephantiasis. 
Figs. 218 to221incl. Fishes of the carp family are very useful in ponds 
to destroy mosquito larve, but the surface-feeding Top-minnow is the 
best to destroy Anopheles the malaria mosquito larva, which develops and 

FIG. 220. Mosquito-boat or Egg-mass, with enlarged eggs and young larve. 
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