Various types of rotting wood microhabitats are presented, basing on many years of the authors studies carried out mainly in the nature reserve „Las Bielański" in Warsaw. The conditions of the formation of rotting wood microhabitats are given and the fauna of Coleoptera inhabiting particular types of rotten wood is described. For more interesting species details of their biology and morphology are given. Also some remarks on the protection of insects related to tree hollows are included.
A description is given of the developmental stages of Rhacopus attenuatus (Ma- Eklin) from Poland. Five instars are recognized, and the first instar is of the triungulin ype. This is the first time triungulin has been found in the coleopterous family Eucnemidae. ГЬе structure of the male and female terminalia, and the bionomics are also provided.
Agonurn (Sericoda) quadripunctatum (De Geek) is a pyropliilous beetle tliat occurs only at sites where forest or peat has been burnt. Adults of this species are certainly attracted to various fires, probably by the smell of smoke from distant places, and stay on a conflagration sites for a short period only. The immature stages of A. (S.) quadripunctatum are described and figured for the first time.
Aulonothroscus laticollis (Rybiński, 1897) is redescribed and illustrated based on newly collected material in the Białowieża Primeval Forest, Poland. Its female is described for the first time.
The mature larva of the European melandryid species Anisoxya fuscula (ILL.) is described and illustrated. The larva lives in dead thin twigs of various deciduous trees. The knowledge of morphology of imagines is completed by drawings of the male and female copulative organs.
Taxonomical and zoocenological analysts of Coleoptera sampled on wet meadows in northeastern part of Poland was made. The representatives of 18 families were found and review of most interesting was described.
The World species of Rhopalocerus Redtenbacher are reviewed, figured and keyed. The following new species are described: B. camerunensis (Cameroon); B. viti (Togo); B. mirei (Cameroon); B. minimus (Madagascar); B. tuberculatus (Madagascar); B. compa- ctus (Key Island); B. papuanus (New Guinea); B. iviei (New Guinea); B. solomonensis (Solomon Isl.). The generic names Corticoides Fairmaire and Bhopalocerophanus Helleb are considered as synonyms of Bhopalocerus, which forms monogeneric tribe Bhopalocerini. The immature stages and biology of B. rondanii (Villa et Villa) are fully described for the first time. A preliminary key to the World tribes of Oolydiidae and brief discussion are provided.