40 



DIPTERA OF MINNESOTA. 



late fall have been found to retain their vitality, and in the spring, 

 when thawed out, to complete their changes and develop into full 

 grown mosquitoes. 



Copyright, 1902, by \Vm. Lyman Underwood 

 Goldfish feeding on mosquito larvae 

 Fig. 34. (From "IIovv to Make ,\ Flower Garden", Doubleday, I'agc & Co.) 



. ENEMIES OF MOSQUITOES- 



Various birds cat large nunilicrs of adult mosquitoes, notably 

 the night hawk, 600 being found in one crop, swallows, martins, 

 ilycatchers, also bats. Dragon flies prey upon them in the air when 

 adult, and the nymph of the dragon fly feeds upon the larval mosquito 

 in the water. Many other aquatic insects are useful in the same 

 way, and many small fish are instrumental in freeing shallow ponds 

 of this pest. The adults are also attacked by one or two varieties of 

 fungus, and by a small mite, resembling superficially the so-called 

 "red-spider." 



