Psocids (Psocoptera) were collected on 22 established plots situated in zonal 4th beechen and 5th fir-beechen vegetation tiers of Slezské Beskydy Mts area during vegetation seasons in 2015–2018. A total of 2860 adult psocids divided into 27 different species were collected. The final composition of taxocenoses was evaluated and compared with the material collected on the same plots by prof. Holuša in 1997–2005. Most psocids were collected in 5th fir-beechen vegetation tier and the greatest amount of psocids considering the tree species was found on Norway spruce. Caecilius burmeisteri was evaluated as the most abundant out of all collected species. The characteristic species combinations specific to vegetation tiers were established as Peripsocus subfasciatus – Enderleinella obsoleta – Caecilius piceus for 4th and Caecilius burmeisteri – Caecilius flavidus – Peripsocus subfasciatus for 5th vegetation tier. Differences between the abundances of Caecilius burmeisteri that increased by 11,60 % and Caecilius flavidus that increased by 9,93 % were the most considerable ones. On the other hand, there were also registered significant differences in abundance of Caecilius despaxi, Enderleinella obsoleta and Peripsocus phaeopterus species that decreased by 8,33, 6,10 and 6,08 % respectively. Some new species were collected in 2015–2018, namely Amphigerontia contaminata, Caecilius fuscopterus, Elipsocus abdominalis, Elipsocus annulatus, Graphopsocus cruciatus, Lachesilla quercus, Loensia variegata, Peripsocus alboguttatus, Peripsocus parvulus, Philotarsus parviceps, and Trichadenotecnum majus. In contrast to that some species which made an appearance in 1997–2005 were not collected, namely Cuneopalpus cyanops, Loensia fasciata, and Mesopsocus unipunctatus.