Photos 6y] 



Caddis-Fly and Caddis-Cases. 



[E. Step. F.L.S. 



Above IS a common caddis-fly on a scale of one and a half times the natural size. Below arc two rows of the cases in which the 

 caddis-wonns reside. Each species has its favourite building materials and a distinct method of disposins; them on the exterior of a 

 silken tube. Ihose in the lower row are built inainlv of sand, the three to the left of sand alone (plus the silk lining), and thoH^ to the 

 nght have a piece of twig added. One in the upper row has a snail-shell built in, and some species build of snail-shells entirely. 



