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Twenty-six families of Trichoptera are recognisd from Australia, and family and generic keys have been prepared previously. Preliminary keys to species were provided for three families (Ecnomidae, Philopotamidae and Tasimiidae), and presented at Albury, February 1997. New and updated preliminary keys to species are provided here for four families (Dipseudopsidae, Glossosomatidae, Polycentropodidae and Psychomyiidae). Some of the illustrations used in the following keys are originals, others, however are based on figures in publications listed in the references. Many larval 'species' or taxa are not positively identified. Some have been reared to undescribed adults. There is probably lumping of some valid species and possibly splitting of others. Until all remaining larvae have been reared to adults and/or identified, these problem 'taxa' cannot be resolved. The designation "sp. AV" is used to indicate an Australian Voucher taxa. Finally, it should be emphasised again that the keys are for late instar larvae. Identification of early instars should only be attempted with extreme care.