Kustov Semen Yurievich RussiaKuban State University, 149 Stavropolskaya St., Krasnodar 350040, Russiaпрофессордоктор биологических наукkustov-semen@mail.ru Author's articles Stress signals of water scavenger beetles Berosus frontifoveatus Kuwert, 1888 and Berosus spinosus Steven, 1808 (Coleoptera: Hydrophilidae)