FISHERIES, GAME AM) FORESTS. IOO, 



Figures 5, 6, 7, and 8 are examples of Caddis worm cases or sheaths, and all came 

 from Caledonia Creek. Fig. 5 is composed of small stones, and is of natural size. 

 Fig. 6 is twice natural size and is composed of gravel and a few larger stones. Fig. 

 7 is composed of bark, and Fig. 8 of charcoal and shells. 



Fig. 5. Fig- 6. Fig. 7. Fig. 8. 



These examples were selected because they were found in a stream on which one 

 of the State hatcheries is situated, and they represent cases constructed by four differ- 

 ent species of Caddis worms. 



McLachlan's Trichoptera of the European Fauna shows cases that are quite 

 unlike the figures here given, but all would be quickly recognized as Caddis worm cases 

 from the illustrations in this paper. 



Fi°\ 9 is an enlarged Caddis worm taken from the case of bark, Fig. 7. 



The line at the side of the worm indicates its actual length. Some 

 \iUw Caddis worms creep along the bottom of a stream, but others load their 

 cases so heavily with gravel that they never move. At best the larvae is a 

 j* poor swimmer, and to move at all they usually creep, hence the name 

 " creeper " applied to the Caddis worm, and also to the May-fly larvae by 

 the anglers in England where both are used for bait in fishing. The Caddis 

 worm has at its hinder end two hooks projecting outward by which it holds 

 caddis worm, itself in its case should an attempt be made to remove it. Reaumur says the 

 cases of gravel and sand are the most difficult to construct, and yet a Caddis worm will 

 make one in five or six hours. In a trout pond on the top of a mountain in Vermont 

 I saw the bottom literally paved with Caddis worm cases and the trout were the finest 

 flavored I ever ate. Originally this pond contained nothing for the trout to eat but 

 small Crustacea and insects in various stages of existence, but minnows were planted 

 by men who were fishing through the ice in winter with live bait, and thereafter the 

 flesh of the trout became light colored in some examples. Wilmurt Lake, in this State, 

 has no other food than Crustacea and insects, and the trout from the lake have been pro- 

 nounced the finest known for the table. 



When the larvae of the Caddis passes to the pupa stage it reconstructs its case and 

 it is generally shorter than before. The pupa emerges from its case, climbs up the 



