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Mesopolobus Westwood, 1833 consists of about 135 valid species worldwide. After the fundamental monograph of Graham (1969), 12 species have been described from continental Europe and three species have been described from the Canary Islands and Malta. Amongst them, one species, Mesopolobus blascoi Askew, 1994, has been synonymised under Mesopolobus maculipennis (Mercet, 1923). Only eight species have been reported from Bulgaria to date.Here we describe a new species, Mesopolobus askewi sp. nov. and present new data on the Bulgarian chalcidoid fauna obtained by sampling in foliage of the Norway spruce, P. abies. Mesopolobus askewi sp. nov. can be distinguished from the most morphologically similar species, M. longicollis Graham, by the following characters: clypeus with deeper emargination, fore wings with basal vein having complete row of setae, head blue to bluish-green, mesosoma bluish-green to green with coppery reflections, legs after coxae mostly fulvous, only distal one-fifth of meso- and metatibiae yellowish, protarsi with fifth segment yellowish, only tarsal claws fuscous, venation pale testaceous. Furthermore, we identified nine valid species of the family Pteromalidae belonging to four genera – Mesopolobus (three spp.), Pachyneuron (one sp.), Stenomalina (one sp.) and Trichomalus (four spp.) and one species of subfamily Asaphesinae (Chalcidoidea, incertae sedis), all represented in our samples by many specimens and none having previously been reported as associated with foliage of the Norway spruce. Three of the species are new records for the Bulgarian fauna.

The present study fills a knowledge gap in the distribution and genetic variation of Morimus populations in the Balkans, by studiyng the representatives of the genus in Bulgaria – M. asper funereus Mulsant, 1862, M. verecundus bulgaricus Danilevsky, 2016 and M. orientalis Reitter, 1894. Additional information is provided for Albania and northern Greece. The mitochondrial cytochrome C oxidase subunit I (COI) marker and the nuclear internal transcribed spacer 2 (ITS2) were used for the genetic analyses. Three of the previously-defined mitochondrial lineages (Lb/HgA, L2 and L3) were detected in Bulgaria, as well as a new lineage (Str) from the Strandzha Mountains (south-eastern Bulgaria). A total of 24 distinct haplotypes, 20 of them in Bulgaria, were found. Bulgarian populations of Morimus demonstrated relatively high nucleotide diversity. The L3 COI lineage was confirmed as the most diverse and frequent in the Balkans. The L3 lineage is dominant in most of Bulgaria, but was not identified in the easternmost parts near the Black Sea coast, where the L2 and Str lineages were found. New data highlighted two dispersal routes of the L2 mitochondrial lineage on the Balkan Peninsula: 1) northwards along the Black Sea coast and 2) westwards, across the Balkans where only disjunct populations remain. North-western Bulgaria seems to be the eastern limit of the basal lineage Lb/HgA distribution. Our results show high levels of genetic exchange between most of the mitochondrially defined lineages, yet some of the easternmost populations probably remained isolated for comparatively longer periods.