430 THE INSECT WORLD. 
the rest. They live in water, and breathe by means of branchious 
sacs, arranged on the abdomen in soft and flexible tufts. They eat 
everything that is presented to them: leaves, and even insects, 
and the larvee of their own kind. The pupz are motionless. They 
stay about a fortnight in their case, whose orifice is closed by 


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Fig. 418.—Pupa of Phryganea Fig. 419.—Phryganea pilosa. 
pilosa, magnified. 
gratings of silk, then break through the gratings and leave their 
prison. In this state (Fig. 418) they swim on the water until they 
meet with an object to which they can attach themselves, and so 
get out. Then they swell till they crack their skin over the back, 
when the perfect insect emerges. . 
The Phryganea pilosa (Fig. 419) is of a yellowish grey, with 
hairy wings little adapted for flymg. These insects do not eat, 
and never leave the neighbourhood of the water. During the day, 
they rest on flowers, on walls, or.on the trunks of trees, their 
wings folded back, and their antennee together. In the evening 
they fly in dense swarms over streams and ponds. They are 
attracted by light, as are many nocturnal insects; and are some- 
times found in great numbers on the lamps on the quays in. 
Paris. 
