FIELD BOOK OF PONDS AND STREAMS 



Fig. 194. — Cases of phryganeids : i, Neuronia 

 postica; 2, cases of larvce of Phryganea vestita. 



rings (Fig, 194, i). When ready to pupate they creep into 

 crevices and burrow into wood or beneath bark. 



Phryganea vestita. — This caddis worm Hves in ponds among 

 submerged plants, rarely on the bottom. Its case is made of 

 narrow strips of leaves arranged in a spiral and securely 

 glued together (Fig. 194). Young larvae do not trim off the 

 ends of the leaf strips, which gives their cases an unkempt, 

 unfinished look (Fig. 194). When preparing to pupate the 

 larva burrows into submerged wood leaving the end of its 

 case protruding. Adults emerge from the middle to the last 

 of June. 



Family Molannidae. — Larvae of the genus Molanna (Fig. 

 195) are often found in great abundance on the sandy bottoms 

 of slow streams and ponds. 



Fig. 195. — Case of Molamia made of sand grains. 



Family Leptoceridae. — These caddis worms all make porta- 

 ble cases but of diverse shapes (Fig. 196). 



Leptocerus. — Larvae of Leptoceriis drag their cornucopia- 

 shaped cases (Fig. 196) over the stones in riffles and in the 

 side waters of rapid streams. 



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