Two new species of Lonchaeidae (Diptera: Schizophora) from the Republic of Mordovia, Russia Author MacGowan, I. Author Ruchin, A. B. text Russian Entomological Journal 2022 2022-03-31 31 1 83 86 http://dx.doi.org/10.15298/rusentj.31.1.17 journal article 10.15298/rusentj.31.1.17 0132-8069 13177702 Earomyia mordovia MacGowan et Ruchin , sp.n. Figs 1–4 . TYPE MATERIAL . Holotype ♂ . RUSSIA : Mordovia , Mordovia State Nature Reserve , quarter 384, 54.762N 43.219E , 25.V– 5.VI.2020 , pine-birch, leg. A. Ruchin. Specimen number NMS – 10005536. DESCRIPTION. Holotype , ♂ . Head: Eyes bare. Frons at narrowest point above lunule approximately 0.5x width of an eye, matt black, frontal setulae approximately 0.4x length of orbital seta, only a few scattered interfrontal setae. Orbital plate black, dulled by microsculpture, bare apart from the orbital seta. Lunule ground colour black, grey dusted. Face and parafacials sub-shining black slightly grey dusted. Anterior genal setulae forming a single regularly spaced row of 4 along mouth margin. Palpi black, with numerous setae. Antennae entirely black, pedicel with a strong seta as long as the length of the postpedicel, postpedicel; length to depth ratio 1.0:1.0, obscurely orange at extreme medial base. Arista microscopically pubescent, entirely black. Thorax: Scutum sub-shining black, light grey dusted with a covering of scattered black setulae. Anepisternum grey dusted with 3 setae in a vertical row along posterior margin, anterior row consisting of one anterior seta with 2 long setulae above and one below, remainder of the sclerite with How to cite this article: MacGowan I., Ruchin A.B. 2022. Two new species of Lonchaeidae ( Diptera : scattered setulae approximately 0.5x length of the marginal setae. Proepisternum and proepimeron each with a single seta. Katepisternum, sub-shining black, the row of setae located near dorsal margin consisting of 2 posterior setae with 3 strong setulae anterior to these, remainder of sclerite bare Anepimeron bare. Scutellum dusted greyish, on margin with a pair of lateral and apical setae, one setula situated between lateral and apical setae on left side, two on left side, a pair of tiny setulae between apical setae, no setulae anterior to the lateral setae. Calypteres pale with a black margin and short black fringe of uniform length. Wing: length 3.0 mm, veins yellow, membrane clear, covered in pale microtrichia, intercostal section of wing, between insertion of Sc and R1, approximately 2x length of cross vein r – m. Legs, black, basal and second tarsomeres of all legs brownish yellow, apical segments brownish, all covered in black setulae, basal tarsomere of fore and hind legs with a ventral fringe of short, stiff black setulae. Abdomen: 1 st sternite bare. Male terminalia: ( Figs 1–4 ): Epandrium boot-shaped, the apical section laying at approximately 90° with respect to the basal, apically with 5 long, thick setae, and 2-3 subsidiary setae on margin anteri- or to these, the long apical setae as long as the apical section. Cerci large and well developed, almost as high as the epandrium, with a group of approximately 10 short setae medially, apex slightly chitinised and densely setulose, stronger setulae on medial surface. Postgonites rather finely spiculate medially. Pregonites apically swollen, with a single medially directed seta, stem bare. In lateral view surstyli projecting from beyond shell of epandrium as a rather rounded-rectangular lobe, 2-3 long strong setae, and 1–2 shorter setae apically, no other significant marginal setae, surstyli setulose apically, both internally and externally. Surstylus basally with 4-5 setae, almost as long and strong as the apical setae. Phallus sinuous with a small pointed apical section. Female: Unknown. ETYMOLOGY. The specific epithet refers to the Republic of Mordovia , the locality of the holotype . REMARKS. Genus Earomyia is one of the most taxonomically difficult within the Lonchaeidae , with few distinguishing external characters identification to species level depends largely on the characters of the male genitalia. With bare eyes, partly yellow tarsomeres, katepisternum bare apart from the row of setae and setulae along dorsal margin and male terminalia with the epandrium sickle-shaped this species falls into a group within the Palearctic fauna which includes E . grusia Morge, 1959 , E . schistopyga Collin, 1953 and E . bazini (Séguy, 1932) . The key specific features of E . mordovia sp.n. are found in the structures of the male terminalia, in particular the cerci which are large and well-developed in comparison to the other three species in this group in which they are small and insignificant. In addition, both E . grusia and E . bazini have a rather short, stout phallus when compared to E . mordovia sp.n. In E . schistopyga the phallus is generally similar but the cerci, which protrude ventrally beyond the shell of the epandrium, are little developed.