The male genital musculature of Anaburrhynckus tristis Bigot (Therevidae) and Metatrichiu waterhousei (Paramonov) (Scenopinidae) are examined and compared to other flies of the superfamily Asiloidea (Diptera). Evidence from musculature confirms that the inner stylus of Therevidae is homologous with the gonostylus of other asiloid flies. The 'outer stylus' of Therevidae is an articulated process of the distal margin of the gonocoxite, here termed the 'inner gonocoxal process'. The genital musculature of the Scenopinidae is very similar to that of the Therevidae. Metatrichiu waterhousei has what we interpret as modified, fused lateral ejaculatory processes lying above the ejaculatory apodeme. The male genital musculature of the Asiloidea is reviewed and implications for the phylogeny of the Asiloidea are discussed. A striking apomorphy of the Asiloidea (except Bombyliidae and Mydidae) is the presence of a third tergosternal muscle bundle M53. The presence of gonocoxal muscles M38 may prove to be a synapomorphy of the Asiloidea (excluding the Bombyliidae). Muscle M33 is a synapomorphy of the clade containing Asilidae, Apioceridae and Mydidae. The division of gonocoxite muscle M33 into two bundles may be a synapomorphy of the Apioceridae.Asiloidea, male genitalia, musculature, Scenopinidae, Therevidae

The male genital and pregenital skeleton and musculature were studied in males of the following species of the Muscidae subfamily Azeliinae: Drymeia firthiana (Huckett, 1965), Drymeia longiseta Sorokina & Pont, 2015, Drymeia segnis (Holmgren, 1883), Thricops nigritellus (Zetterstedt, 1838), Thricops hirtulus (Zetterstedt, 1838), Hydrotaea dentipes (Fabricius, 1805), Muscina stabulans (Fallén, 1817), and Muscina levida (Harris, 1780). Descriptions and figures of the genital sclerites and muscles of D. firthiana and M. stabulans are given. A comparison was made between the genital segments and muscles of previously studied species of Mydaeinae and Muscinae and those of the Azeliinae. Based on the structure of the skeleton and muscles of syntergosternite VII + VIII and the phallapodeme muscles, significant differences were found between the subfamily Azeliinae and the subfamilies Mydaeinae and Muscinae. The basal position of the Azeliinae within the family Muscidae was confirmed. A comparison of the genital segments and muscles of the Muscidae with those of the Scathophagidae (Scathophaga stercoraria (Linnaeus, 1758)) and Anthomyiidae (Delia platura (Meigen, 1826)) was made. Tendencies in reduction of the pregenital segments and musculature, as well as of the phallapodeme muscles in the evolution of the Muscoidea have been revealed. The complete set of phallapodeme muscles in the Scathophagidae and Anthomyiidae corresponds to the basal state, and therefore the structure of the genital sclerites and muscles in the Muscidae shows a certain degree of reduction. The progressive changes in the Muscidae from the Azeliinae through the Mydaeinae to the Muscinae were traced.

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