THE CANADIAN ENTOMOLOGIST. 



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its several stages, while in fig. 10 the perfect female is shown with wings 

 expanded. The larva, which is a diabolical looking creature, is seen at 

 a, figg ; it spends the earlier portion of its life in the water, crawling and 

 swimming about upon the bottoms of rivers and streams, feeding upon 



the larvae of various other insects inhabiting the water. Mr. Riley has 

 published an excellent paper on this insect in the first volume of the 

 American Entomologist, from which most of the remarks following are 

 condensed. 



