Leo Edward Miller, In the Wilds of South America, Londres, Scribner’s sons, 1918, p. 80.

There was plenty of tender, luscious grass for the mules. Near the river large numbers of butterflies settled on the moist sand to drink; the boulder on the bottom of the clear, cold stream had many houses of the caddis-fly cemented to them — little pebbly mummy- cases in which the owner lay snugly ensconced in the silky lining and quickly repaired the break if we opened, them.