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This paper provides data on distribution of 13 chalcid wasp species (Hymenoptera: Chalcidoidea: Chalcididae) belonging to 9 genera and three subfamilies Chalcidinae, Dirhininae and Haltichellinae from Hormozgan province, southern Iran. All collected species are new records for the province. Two species Dirhinus excavatus Dalman, 1818 and Hockeria bifasciata Walker, 1834 are recorded from Iran for the first time. In the present study, D. excavatus is a new species record for the Palaearctic region. An updated list of all known species of Chalcididae from Iran is also included.

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The fauna of the subfamily Opiinae was studied in northern parts of Iran. A total of eight species including Biosteres rusticus (Haliday, 1837), Phaedrotoma depeculator Foerster, 1862, Phaedrotoma exigua (Wesmael, 1835), Phaedrotoma pulchriventris (Fischer, 1958), Phaedrotoma variegatus (Szepligeti, 1896), Xynobius curtifemur (Fischer, 1961), Xynobius caelatus (Haliday, 1837), and Utetes rotundiventris (Thomson, 1895) were identified of which the four last species are reported for the first time from Iran. A key for identification of the collected species as well as the general distribution of each species either in the world or within Iran has been provided.

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True flies (Insecta: Diptera) are widely distributed and the key components in most ecosystems. The objective of this study was to identify the true flies’ diversity through DNA barcoding technique (658 bp sequence from the 5′-end of cytochromeoxidase I) in Bangladesh. Specimens were collected by a Malaise trap at Chittagong University Campus between April 2014 and March 2015. In this study, we examined 36476 sequences of 38267 true flies, and resulted 105 species, 109 genera, 54 subfamilies and 59 families. Among them 79 species, 69 genera, 12 subfamilies and 23 families are new country records. All the specimen records with the Barcode Index Numbers (BINs) (the species proxies), are available on the Barcode of Life Data System (BOLD).

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We provide new findings on the distribution of 13 species of the family Gasteruptiidae (Hymenoptera, Evanioidea) collected at 17 sampling localities in Fars and Hormozgan Provinces, south of Iran. The specimens were collected using Malaise traps during 2013–2019. Two species, Gasteruption sericeipes Kieffer, 1911 and G. syriacum Szépligeti, 1903 are new additions to the Iranian wasp fauna. Furthermore, 10 species are new provincial records. With the present additions, the total number of gasteruptiids recorded from Hormozgan, Fars and Iran is currently raised to 2, 14 and 29 species, respectively. For each species, provincial distribution in Iran and overall distribution, as well as the flight period, are presented and discussed together with the available references.

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A faunistic list of Syrphidae sampled in the agroecosystems of Neyshabur (Khorasan-Razavi Province) through Malaise, yellow water traps and hand net is hereby presented for the first time. A total of 22 species were collected, including 13 species through Malaise trap, 5 through yellow water trap as well as representatives of all species sampled through hand net. Among the species collected, 8 including phytophagous ones were exclusively sampled through hand net. In the case of Malaise trap the hover fly population was strongly dominated (73%) by 3 common species of: Sphaerophoria scripta, Episyrphus balteatus, and Eupeodes corollae while, in the yellow water trap, Episyrphus balteatus was the key species representing about 45% of all specimens. Shannon-Weiner index of biodiversity found out for Malaise trap (H= 1.86) was higher than that calculated for yellow water trap (H= 1.39). The relative efficiency of the three collection methods is discussed.