New European host records for the Acroceridae species Acrocera orbiculus (Fabricius) and Ogcodes reginae Trojan are reported. Acrocera orbiculus was reared from Amaurobius erberi (Keyserling), and O. reginae from Clubiona leucaspis (Simon) and Evarcha jucunda (Lucas). Where possible, DNA-barcodes are presented for reared endoparasitoids and their host specimens. Based on mitochondrial COI, the intraspecific genetic variability of 15 western Palaearctic A. orbiculus is discussed. Maximum likelihood analysis reveals two clades, though they have low statistical support and no distinct barcoding gap. Therefore, we consider all barcoded specimens of A. orbiculus to be a single biological species with a high degree of phenotypic plasticity regarding body size and coloration. Based on molecular and morphological evidence, Paracrocera kaszabi Majer, Paracrocera manevali Séguy and Paracrocera minuscula Séguy are placed in synonymy with A. orbiculus. The male of the Canary Islands endemic Acrocera cabrerae Frey is described for the first time.

Records of 11 species of three families of acalyptrate Diptera, Micropezidae (4 species), Clusiidae (4) and Periscelididae (3) are given from Portugal. Seven species are new faunal additions to this country, viz. Neria cibaria (Linnaeus, 1761), Neria octoannulata (Strobl, 1899) (both Micropezidae), Clusiodes albimanus (Meigen, 1830), C. caledonicus (Collin, 1912), C. gentilis (Collin, 1912) (all Clusiidae), Periscelis (Myodris) piricercus Carles-Tolrá & Verdugo Páez, 2009 and P. (Periscelis) sp. n. near P. winnertzii Egger, 1862 (Periscelididae). Distribution and biology of all recorded species are reviewed and supplemented with new information based on Portuguese material and notes on the taxonomy and variability of some species are appended.

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The taxonomy of the genus Platypygus Loew is summarized, previously described species are reviewed based on examination of types, and a key to known species of the genus worldwide is presented. All previously described species are diagnosed and illustrated. The male genitalia of P. ridibundus (Costa) and female genitalia of P. americanus Melander are described for the first time. Some characters supporting the monophyly of the genus Platypygus are discussed and the Nearctic Cyrtisiopsis americanus (Melander) is restored to its original combination as Platypygus americanus. The type status of Platypygus bellus Loew, P. lativentris Loew, P. pumilio Loew, and P. turkmenorum Paramonov is clarified and a lectotype is selected for Platypygus kurdorum Paramonov and P. tauricus Paramonov. New country records are given for the following species: P. bellus (Greece); P. chrysanthemi (Israel, Jordan); P. kurdorum (Israel, Jordan, Syria); P. limatus (Nepal, Thailand); P. pumilio (Greece, Turkmenistan); P. ridibundus (Cyprus, Israel, Portugal), P. titanomedea (Jordan, Turkey).

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