Notes on Palaearctic Muscina (Diptera, Muscidae) Author Vikhrev, Nikita E. Zoological Museum of Moscow University, 2 Bolshaya Nikitskaya Str., 125009, Moscow, Russia nikita6510@yandex.ru Author Esin, Mikhail N. 0000-0003-0862-7601 Joint Directorate of the Mordovia State Nature Reserve and National Park “ Smolny ”, 30 Krasnaya Str., 430005, Saransk, Russia esinmishka@gmail.com text Amurian Zoological Journal 2023 2023-01-09 XV 1 31 41 http://dx.doi.org/10.33910/2686-9519-2023-15-1-31-41 journal article 296618 10.33910/2686-9519-2023-15-1-31-41 c47d0db0-0e05-469e-b642-2375be2c3bfc add_ISSN_here 11089068 1BAE24CF-E715-47AA-92C8-E70C48D4871D Key for Muscina ♂♂ , ♀♀ 1. Cell R 4+5 strongly narrowed towards wing margin, at wing margin it is distinctly less than half as wide as at it widest part ( Figs. 1–3 ). Lateral surface of scutellum covered with dense hairs, some of these hairs are at ventral margin of scutellum or even at ventral surface. Knob of halter dark. (Tibiae dark. Palpi yellow. Apex of pedicel and base of postpedicel more or less reddish. Male frontal vitta linear.)............... 2 — Cell R 4+5 slightly narrowed towards wing margin, at wing margin it is almost 3/4 as wide as at it widest part ( Figs. 4–5 ). Lateral surface of scutellum covered with less dense hairs, they do not reach ventral margin of scutellum. Knob of halter yellow to dirty yellow. (Lower calypter always narrow.).................................. 3 2. Lower calypter broad, distinctly broader than upper one ( Fig. 12 ). Cell R 4+5 more strongly narrowed towards wing margin (about 0.36 as wide as at its widest part, Figs 1–2 ). Some hairs present around anterior notopleural seta. Body usually with a metallic-bluish tint ( Fig. 1 )................................ pascuorum Meigen — Lower calypter narrower, about as broad as upper one ( Fig. 13 ). Cell R 4+5 less strongly narrowed towards wing margin (about 0.44 as wide as at its widest part, Fig. 3 ). Hairs around anterior notopleural seta usually absent. Body without metallic-bluish tint......................... prolapsa Harris 3. Legs including tibiae black. Palpi and antennae black. In specimens collected long ago tibiae and palpi may become brownish. ♂ : Frontal vitta usually linear, sometimes wider, distinct ( Figs. 8–9 ). f3 at base with 2–3 long fine v setae........... levida Harris — At least tibiae yellow. Palpi yellow. Apex of pedicel and base of postpedicel more or less reddish. (Freshly emerged specimens of M. angustifrons may have palpi and antenna entirely black.)................... 4 4. Antenna entirely yellow or almost so ( Fig. 6 ). Mid and hind femora entirely yellow. Body length at most 7 mm . ♂ : distance between eyes wider than two widths of postpedicel ( Fig.6 )............... minor Portschinsky — Antenna mostly dark ( Figs 7 , 10 ). Mid and hind femora partly or entirely dark. Body length always almost more than 7 mm . ♂ : distance between eyes less than two widths of postpedicel at most as in Fig. 7........ 5 5. Mid and hind femur partly yellow. Basicosta yellow. (Palpi always yellow; apex of pedicel and base of postpedicel yellow.) ♂ : Frontoorbital plates separated by distinct frontal vitta ( Fig. 7 ). f3 at basal without long fine v setae.................. stabulans Fallen — Mid and hind femur entirely dark. Basicosta black. (Palpi, apex of pedicel and base of postpedicel usually yellow, but dark in freshly emerged specimens, see Figs. 10, 11 ) ♂ : Frontal vitta linear. f3 at basal 1/3 with 3–4 long fine v setae................................... angustifrons Loew