Eric Tavernier & John Moore,  The angler’s week-end book, Ill. Margit Hamand, Londres,  Seely Services & Co., 1935, p. 393.

Caddis-Grub- Also called case-worm and stick-bait. These grubs resemble very fat gentles, but are enclosed in small cases made of leaves, sand, etc. they are found in ditches and shallow streams , or at the edges of rivers.