MAY-FLIES AND TITEIR NEIGHBOURS 223 



builciino- cases (_)r Lubes in which to protect the 

 more tender parts ot their bodies from sticklebacks 

 and other enemies. As soon as they leave the 



f- 



148. A caddis-worm dt-nuded ot iLb ca^r 

 :■' 4 diameters 



eo-o- the caclclis-^rubs commence building, the 

 different species and families each manufacturing 

 their dwelling-places in different forms and of 

 different materials. Even individuals of the same 



