AQUATIC INSECTS IN NEW YORK STATB Dot 
The pupae are incased in cocoons which are firmly fixed to 
the rocks, these cocoons sometimes occurring in dense masses, 
forming a carpetlike covering on the rocks; in other species they 
occur separately or in small groups. The pupae, like the larvae, 
breathe by tracheal gills; but in this stage the gills are borne 
by the prothorax. The adult fly, on emerging from the pupa 
skin, rises to the surface of the water and takes flight at once. 
Soon after this the eggs are laid. 
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