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From Upper-Cretaceous amber discovered in Canada (Alberta) and in Siberia (Taymyr), 10 species of Trichoptera are recognized. One of them belongs to the recent genus Rhyacophila, one probably to the recent genus Holocentropus; the following new genera are described: Palaeohydrobiosis (Hydrobiosidae), Electralberta (type of the new family Electralbertidae), Archaeopolycentra (Polycentropodidae), Taymyrelectron (type of the new family Taymyrelectronidae), Praeathripsodes (Leptoceridae), Calamodontus (Calamoceratidae or Odontoceridae). One specimen is a philopotamid, and one an incertae sedis member of the Hydropsychoidea. These records represent a considerable enrichment of our knowledge of the Cretaceous caddisfly fauna, practically unknown until now. Phylogenetical, biogeographical and other conclusions are drawn from the study of these fossils and of their Recent and Eocene-Oligocene relatives.

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Intensive sampling on the three perennial streams of Isla de Margarita enabled identification of 11 caddisfly species (most of them new records for the island), two species in the genera Neotrichia and Leptonema being described as new. The new Neotrichia belongs to a group comprising several species described from Surinam; the new Leptonema, although belonging to a small group of Amazonian species, is quite distinctive in several respects. There is presently incomplete evidence about the existence, or former existence, of 8 additional species in the island's fauna.

The larvae of Caddisflies from Cuba were extremely poorly known, in contrast to the adults of these insects. By sampling and examining «metamorphotypes» (i.e. closed pupal cases containing not only the pupa, but also the larval sclerites shed at pupation, and, if the pupa is «ripe», also allowing examination of the genitalia), and also by using circumstantial evidence, the larvae of a number of species from a collection made by the author in 1973 were associated with adults. Described and illustrated here are all associated larvae (and sometimes cases) offering reliable characters for their identification, in the genera