Type material. Holotype Ơ: Ukraine: Kharkiv Region, near Orchyk (49°09ʹ N, 35°01ʹ E), 15.05.2011, 9.00–9.30, dry grass clearing in coniferous forest (Guglya) (No Н-71) (dissected). Paratypes: 2 Ơ, labels as in the holotype (No Н-72, Н-73); 1 Ơ, Kharkiv, Sokolnyky (49°25ʹ N, 36°15ʹ E), 01.05.2012, motley grass (No Н-74); 1 Ơ, Kharkiv, Piatykhatky (50°05ʹ N, 36°14ʹ E), 03.05.2014, deep narrow gully (No Н-75) (Guglya); 1 Ơ, same locality (50°05ʹ N, 36°14ʹ E), 28.08.2015, 15.30–16.30, sweeping on high grass in a gully (Centaurea, Cirsium, Medicago) (No Н-76); 1 ♀, same locality and date, 16.30–17.30, sweeping on low grass in a gully (Cicorium, Fragaria, Vicia, Cirsium, Poacea) (No Н-77) (Guglya) (all the paratypes dissected).

D e s c r i p t i o n. Head (figs 1 – 2). Orbit projected above eye in profile; 2 orb s, 2 fr s (all strong), space between fr s 2.5× as big as spaces between neighbouring 2nd fr s and 1st and 2nd orb s; frorb sta in two rows, proclinate near the eye and reclinate near the frons; orbit wide and shining (frontal view); frontal carina narrow; lunule black, matt, high, acute dorsally, with distinct furrow; ocellar triangle dark brown, matt, large, reaching the lunule, with very slight contours; frons the same; vibrissa and four sbvb s equal; maximum high of eye 3.5× maximum high of gena; gena angular; 1st flagellomere round (lateral view).

Wing (fig. 7) hyaline; costal vein brown, other veins light brown; costa reaching M 1; last section of CuA 1 0.6× as long as penultimate; costal sections 2–4 in the ratio of 5.2: 1.8: 1.00; calypter, margin and fringe white; hairs of fringe rather long. Wing length 2.5 (Ơ) to 2.7 (♀) mm. Mesonotum shining black, with greenish or coppery undertone (dorsal view); scutellum more matt; 2 dc; ac orange-red, in 8–9 irregular rows at level of 2nd dc. Halters and legs uniformly dark brown. Mesonotum and scutellum of female more shining and green.

Male terminalia (figs 3 – 6, 10). Epandrium covered with sparse short hairs; cerci with long hairs only; inner surface of surstylus with numerous small prensisetae and one long seta located ventrally; hypandrium V-shaped, with rounded posterior apex; ejaculatory apodeme as long as phallus. Phallus 0.21 mm long; distiphallus trapezoid-shaped (ventral view); mesophallus long; basiphallus strongly sclerotized, narrowing anteriorly; both arms connected by crosspiece posteriorly.

Female terminalia (figs 8 – 9). Spermathecae inequal, dark brown, oval, with flat base; collar cylindrical in biggest one and finger-shaped in smallest one. Egg guide narrow, 4.7× as long as its maximum width, 3.7–4.3× as long as spermatheca length, acute apically; medial membrane with two rows of small brown teeth.

B i o n o m i c s. Two generations are recorded in May and August. Host plant unknown.

D i a g n o s i s. Superficially the new species is similar to Melanagromyza aeneoventris (Fallén, 1823) (Papp, Černý, 2015) having orbit projected above eye in profile; 2 orb s and 2 fr s with space between fr s 2.0–2.5× as big as spaces between neighbouring 2nd fr s and 1st and 2nd orb s and frorb sta in two rows proclinate and reclinate together. The new species differs from it by having white margin of calypter; mesonotum with greenish-coppery tinge; narrower, higher and acute dorsally lunule and phallus shape: distiphallus trapezoidshaped, widening posteriorly; arms of basiphallus are connected by crosspiece posteriorly (ventral view), whereas in M. aeneoventris distiphallus triangular, elongated and narrowing posteriorly; arms of basiphallus not connected posteriorly (ventral view).

C o m m e n t s. One paratype has aberrant basiphallus (fig. 10), but in other respects it is identical to all specimen of the type series.

E t y m o l o g y. The species name reflects the trapeziod shape of distiphallus.