Insects were collected since 1978 from the areas of Moquehue, Pilhue and Filcún (Department of Aluminé - Neuquén - Argentina) wich are part of the north Subantartic Forests where the main tree-species are Araucaria araucana (Mol.) Koch (Araucariaceae) and Nothofagus dombeyi (Mirb.) Blume, N. pumilio (Poepp.et endl.) Krasser and N. antarctica (Forst. F.) Oerst (Fagaceae). Information concerning the entomological fauna and flora of these native forests exploited since the 1950's for their timber, is scarce. The captured insects were associated with their hosts by observation and bibliography. The Coleoptera collected belong to 52 species of 17 families, wich are associated with A. araucana: 5 species, with Nothofagus spp: 13, with forest grove vegetation: 8. There are 6 predator species and 13 wich have unknown or other associations. Some species have more than one relationship.