CHROMOSOME COMPLEMENT AND MEIOSIS IN 8 BISEXUAL SPECIES OF WEEVIL (CURCULIONIDAE, COLEOPTERA)

Karyological investigations were carried our on eight species of bisex ual weevil belonging to five subfamilies, viz. - Otiorhynchinae, Brach yderinae, Cleoninae, Hylobiinae, Ceutorhynchinae. The following number s of chromosomes were found in individual species: 2n=22, n male=10tXy (p) in Otiorhynchus opulentus Germ., Phyllobius oblongus (L.), Phyllob ius arborator (Herbst), Rhinomiasforticornis (Boh.), Polydrusus rufico rnis (Bonsd.); 2n=44, n male=21+Xy(p) in Lixus cardui Ol.; 2n=36, n ma le=17tXy(p) in Adexius scrobipennis Gyll., and 2n=28, n male=13+Xy(p) in Nedyus quadrima-culatus (L.). The heterochromosomes of all species form, in the first meiotic metaphase, a parachute bivalent. The mitose s were observed and analysed in three species. The karyotype of Nedyus quadrimaculatus (L.) is constituted by metacentric chromosomes; the k aryotypes of Phyllobius oblongus (L.) and Rhinomias forticornis (Boh.) by metacentric and submetacentric ones.