This article presents results of biology research of two species of Scarabaeidae under the conditions of the Republic of Moldova. The Cetonia aurata development cycle takes place within two years, is a monovoltine spring-summer breeder, hibernates in the adultsand sometime in the larval stage. The adults and larvae lives in plant composts, in decomposed foliage, in rotten roots of plants. Adults sometimes attack inflorescences of fruit trees, so they can be considered pests of orchards, but some larvae live in the soil, consume plant remains and plant composts, so this saprofage species is considered and useful. The second species Protaetia affinis affinis is a mesophyla species with summer-autumn reproduction type, hibernates in the adult stage and larvae, lives in deciduous and semi-degraded vegetal debris from deciduous forests, forests strips, orchards. Species do not cause damage to forestry and agriculture.