NEUEOPTEBA. 



431 



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 larvae of their own kind. The pupae are motionless. They 

 stay about a fortnight in their case, whose orifice is closed by 



Fig. 418. Pupa of Phryganea 

 pilosa, magnified. 



Fig. 419. Phryganea pilosa. 



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 flying. 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 antennae 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. 



