GRAPHOGNATHUS BUCHANAN A NEW SYNONYM OF NAUPACTUS DEJEAN AND SYSTEMATICS OF THE NAUPACTUS-LEUCOLOMA SPECIES GROUP (COLEOPTERA, CURCULIONIDAE)

Graphognathus Buchanan is herein considered as a new synonym of Naupac tus Dejean. The three species traditionally assigned to Graphognathus, N. leucoloma Boheman, N. peregrinus (Buchanan) and N. minor (Buchanan ), plus two species previously described in Naupactus Dejean, N. albol ateralis Hustache and N. tucumanensis Hustache are included in the N. leucoloma species group. The five species are native to South America, and the first three have been introduced in other latitudes becoming pests of agriculture. Although Naupactus leucoloma and N. peregrinus a re parthenogenetic in most of their ranges, in Argentina and Paraguay there are some bisexual populations. This paper includes a description of the N. leucoloma species group, redescriptions of all its species, including males; one key for the identification of adults and another key to determine first instar larvae; illustrations of eggs, diagnost ic characters of larvae, habitus and genitalia of adults of both sexes , and maps of distribution of the five species in South America.