Rüschkamp ('21) observed the feeding habits of seven species of five genera, confirming the generally accepted statements that Dermestidae live in dead animal or plant materials. But the larvae of some species of Thaumaglossa have been reported from the living egg clusters of Mantidae. Among these are T. bimaculata Arrow from the egg masses of Sphodromantis gastica and S. guttata in Pretoria. The larvae appear to eat both the eggs an the membranous substance enveloping them, hollowing out the interior of the cluster without destroying the outer layer (Arrow, '15).