Chlorophorus robustior Pic, 1900 (Coleoptera: Cerambycidae) is a new record for the Turkish fauna and a new sainfoin (Onobrychis sativa Lam.) pest for Turkey. Its biology, damage, and infestation ratio were studied in Erzurum (Turkey) during 1996 and 1997. The biological stages of the pest are briefly described. The pest over winters within galleries in roots of sainfoin as mature larvae. Pupation in the galleries begins in mid-May. At the end of June, the adults appear. The females lay their eggs individually into the stem base 710 days after emerging. The first larva begins to construct a gallery in the root. Each gallery has one larva, and each plant has one gallery. The last in star larva over winters in the same gallery toward mid-September. Consequently, C. robustior produces one generation a year. Infestation level may reach up to1416%.
The putative monophyly and systematic position of Merodon nigritarsis group was assessed based on morphological and molecular data of the mitochondrial COI and nuclear 28S rRNA genes. The previously reported concept of the group has been redefined, and M. crassifemoris Paramonov, 1925 is now excluded. The related M. avidus group is redefined here, including the Merodon avidus complex and M. femoratus Sack, 1913. Species delimitation of morphologically defined species of M. nigritarsis group was well supported by COI gene analysis, with the exception of M. alagoezicus Paramonov, 1925 and M. lucasiHurkmans, 1993. Descriptions are given for three new species of the M. nigritarsis species group: Merodon cohurnus Vujić, Likov et Radenković sp. n., Merodon longisetus Vujić, Radenković et Likov sp. n. and Merodon obstipus Vujić, Radenković et Likov sp. n., and one new species from the M. avidus group: Merodon rutitarsis Likov, Vujić et Radenković sp. n. A lectotype is designated for M. femoratus Sack, 1913, and two new synonymies of this species were proposed: M. biarcuatus Curran, 1939 and M. elegansHurkmans, 1993. Here we review 18 species from the M. nigritarsis group and six species from the M. avidus group and provide morphological diagnoses of the species groups. Additionally, diagnosis of 12 branches (groups or individual taxa) of M. avidus-nigritarsis lineage, an illustrated diagnostic key for the males, and distribution map are provided for the new species.