CADDIS FLIES. 



403 



state, together with the perfect insects. All the figures have been 

 drawn from actual specimens, some of which are in the British 

 Museum, and others in my own collection. The materials of 

 which the nest is made depend greatly on the locality in which 

 the insect is hatched, and in a rather large series of Caddis nests 

 now before me there are some very remarkable instances of the 

 manner in which the insect has been obliged to adapt itself to 

 circumstances. The most common style of case is that which is 

 composed of a number of sticks and grass stems laid longitudin- 

 ally upon each other like the fasces of the Roman consuls. Of 





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Caddis. 



these I have specimens of various sizes and shapes, some being 

 barely half an inch long, while others measure four times that 

 length, the sticks being sometimes placed so irregularly that the 

 home of the architect is not easily seen. The creatures are not 

 at all particular about the straightness of the sticks, but take them 



