AQUATIC INSECTS OF FRESHWATER 



Of these Anopheles bear the Plasmodium malaria which produces malarial 

 fever, Culex pipiens those of Roman fever, Stegomyia fasciata those of yellow 



FIG. 219. yii!aniyi.oi,!!^xMo%, Anopheles quadrimamlatus. Adult male and female. Greatly enlarged. 



fever, and Culex ciliaris the parasitic Filarias which produce elephantiasis. 

 Figs. 218 to 221 incl. Fishes of the carp family are very useful in ponds 

 to destroy mosquito larvas, 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 larvae. 



266 



