The moth-flies or case worms (Phryganea rhombica)

1639. The moth-flies or case worms (fig. 283. c, Phryganea rhombica) are to be noticed as beneficial insects, on account of the food which they afford in the larvï¾µ state to fishes. Residing in the water, and being of a tender texture, they form moveable cases of bits of sand, sticks, &c., in which they reside. On account of their peculiar characters they have been separated from the other Neuroptera by many entomologists, and formed into a separate order called Trichoptera.