The exhibition of insects is situated in a large hall (ca. 260 sq. m) of the last (4-th) museum’s floor. It contains 728 boxes arranged in 20 show-cases. With a few exceptions, the arrangement is after systematic order. Included are most of the insect’s orders, prevailing attention being paid to the largest ones — Lepidoptera, Coleoptera, Hymenoptera, Diptera, Orthoptera, etc.
A part of the boxes are made as biological units showing elements of development, habitats, behaviour, trophic relations, pests and damage-doers, etc., usually accompanied by explanatory texts. Exhibited are both species of the Bulgarian and the adjacent Balkan entomofauna, and specimens from various parts of the world — the Tropics (butterflies, beetles), Central Europe, Nigeria, Indonesia, The Himalayas, New Guinea, Lapland, etc.
One show-case is devoted to the entomofauna of the Bulgarian caves and other protected insects. Several wall posters illustrate some general moments within the world of insects — their relative part in the animal kingdom, the ratios between the larger orders, the mechanisms of flying and walking, the hydroentomocoenose in freshwater ecosystems, etc.