332 NATURAL HISTORY OF AQUATIC INSECTS CH. 



but not continuously, by the sudden ejection of water 

 from the tail. In air the water can be spirted to a 

 distance of several inches. It is, however, only a very 



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slow or inattentive animal which could be captured 

 by the direct pursuit of a Dragon-fly larva. It trusts 

 chiefly to its sombre coloration and its motionless 



