The study of the two families took into account the economic factor, because there are not few species of Rhynchitidae and Attelabidae that produced important damages in the vine, orchard, and forest areas as well as in the agricultural cultures. The researches took place during 1996-2006. The fauna material was collected during the travels to different localities in the country. I n some investigated localities the collecting and the observations in the field were extended for at least 2 -3 days and for the vine ecosystems with a great attack of Byctiscus betulae the researches lasted for 3-4 years, at regulated intervals of 3-4 weeks. In order to establish the structural parameters there was processed a rich material of over 1300 adult samples belonging to 17 species from a total of 29, which are to be found in Romania. The material comes from 42 localities. The way of collecting was : directly with the hand, with the entomologic net, by drillings in the soil and by using the device of obtaining the zoophagous parasites
