Four areas in Montenegro were visited at the end of June - beginning of July 2020. We found 12 species of Zygaenidae. Second records for Adscita statices drenowskii (Alberti, 1939) and Jordanita globulariae (Hübner, 1793) for Montenegro are provided here. Additional records are given for J. notata (Zeller, 1847) and Zygaena punctum Ochsenheimer, 1808 for which there are less than ten localities known in Montenegro.

Perizoma obsoletata (Herrich-Schäffer, 1838) is shown to be a part of the Balkan fauna. Pabulatrix pabulatricula (Brahm, 1791) is new for the Western Balkans. One genus and 12 species are new and 20 species are reported for the second time for Albania. For Montenegro, one genus and eight species are new and two species are recorded for the first time. One genus and four species are new for the Republic of North Macedonia and another five species are reported for the second time from that country. One genus and three species are new for Bosnia and Herzegovina. Four species are reported for the second time and two for the third time for Serbia. Localities for Charissa pfeifferi (Wehrli, 1926) in Bulgaria are recorded for the first time. Data for some other interesting species from these countries and Greece are also presented. Most specimens were collected at light in 2019. Illustrations of specimens and their genitalia are given when necessary. Everted vesicas of some Geometridae species are illustrated for the first time.

Theresimima ampellophaga (Bayle-Barelle, 1808) was known from only three sites in North Macedonia and has never been considered as a pest of grapevine in this territory. The last time it was recorded in North Macedonia about 80 years ago. Traps baited with synthetic sex attractant EFETOV-2 (racemic mixture of (2R)-butyl 2-dodecenoate and (2S)-butyl 2-dodecenoate) were set at two localities near Ohrid Lake at Trebenishta village and between Ljubanishta village and Sveti Naum Monastery in 2016, in Vardar river valley near Demir Kapija in 2017 and near Dojran Lake in 2018. In North Macedonia sex attractants were used for the detection of this species for the first time. We recorded Th. ampellophaga in traps at all four monitored localities.

Paracossulus thrips (Hübner, 1818) and Lignyoptera fumidaria (Hübner, 1825), both species listed on Annex II of the Council Directive 92/43/EEC, are reported for the first time for Serbia from two distinct localities on Vidlič Mt. Some new localities from the edge of the range of both these species are reported from Bulgaria. Previous reports of these species in the Balkan Peninsula are summarized and comments are given on the habitats, threats and conservation requirements of both species. Serbian vernacular names for both species are proposed.