The common name for this family are bagworms. The larvae make cases which are composed of silk,
leaves and twigs. These cases are carried around with them while they feed and they pupate inside of
them. The adult males upon emerging locate the case of a female. The male mates with the wingless
female while she is still inside the bag. The female may also lay her eggs inside the bag.
Borror, D.J., C.A. Triplehorn, and N.F. Johnson. 1989 An introduction to the study of insects. 6th edition, Harcourt Brace College Publishers, New York. p. 366