Stuart Ward Frost, General Entomology, New York, McGraw-Hill, 1942, p. 445.

The majority of them build portable cases, which are constructed chiefly by the Phryganeidae, Molannidae, Leptocirade, Odontoceridae, Limnophilidae, and Sericostomatidae. All are somewhat similar in habits but differ as to habitats and materials used as coverings.