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The Nearctic Sceliphron caementarium (Drury, 1773) is widely distributed in the Western Palearctic and is spreading to new territories. Despite the large quantities of data on citizen-science platforms, these records have been mostly overlooked. In this publication, the first records of S. caementarium from six Eastern European and Balkan countries (Albania, Greece, Montenegro, Poland, Serbia, and Slovakia) are presented. Data derived from online citizen-science observations and museum specimens supplement our knowledge of this species’ range. The distribution of this species in Europe and possible ecological implications are discussed.

Aulacidae are parasitoids of wood-boring larvae of Hymenoptera and Coleoptera, known in all zoogeographic regions of the World, except Antarctic. Two aulacids, Pristaulacus compressus (Spinola, 1808) and the rare Pristaulacus mourguesi Maneval, 1935, have been recently collected from Iran, the latter being a new record. Based on available data, the Iranian aulacid fauna includes five species within a single genus, Pristaulacus Kieffer 1900. A brief taxonomic treatment, as well as morphometric data and an illustrated key to species, are provided.