Elgiva, Meigen, 1838

Vikhrev, Nikita E. & Yanbulat, Maria O., 2021, Notes on genus Elgiva Meigen, 1838 (Diptera, Sciomyzidae), Amurian Zoological Journal XIII (2), pp. 257-264 : 262

Key to Elgiva ♂ ♀

1. Thorax bluish-grey dusted, contrasting to brownish abdomen. Anepisternum with a round brown spot below notopleural setae (Fig. 1). Anepisternum apart from hairs with 1 (0–2) rather strong seta. Cheek distinctly narrower than height of eye. ♂: surstyli as in Fig. 6 : anterior lobe long, strongly curved, pointed at apex; posterior lobe small, also pointed at apex. (f1 without ventral spines. Prosternum bare. Wings with a butterfly-like dark spot near apex of R 2+3. Both orbito-antennal and orbital spots contrasting black, distinct.)...................... cucularia Linnaeus

— Thorax brownish, concolour with abdomen. Anepisternum without dark spot and without strong seta, only with hairs. Cheek about as high as that height of eye...... 2

2. Prosternum bare. f 1 in apical half with 1–2 pv and 1–4 av spines apart from fine hairs. Wings with a butterfly-like dark spot near apex of R 2+3. Orbito-antennal spot black, orbital spot usually present. Thoracic vittae less distinct. ♂: surstyli as in Fig. 7 : anterior lobe wide, not curved; posterior lobe indistinct............ solicita Harris

— Prosternum with 1–3 pairs of hairs. f1 ventrally with fine hairs only. Wings without butterfly-like dark spot near apex of R 2+3. Orbito-antennal spot brown, orbital spot absent. Thoracic vittae more distinct. ♂: surstyli as in Fig. 8 : anterior lobe wide and rounded at apex, posterior lobe long, strongly curved; outer basal part of each surstylus thickened, forming a characteristic ear-like structure. Apex of abdomen globular, ear-like structure at base of surstyli usually visible on intact specimen as in Figs 4–5 ...... divisa Loew

Figures

Figs 3–8. Elgiva: 3 — wing of E. solicita with butterfly-like dark spot near apex of R2+3; 4 — E. divisa, male; 5 — close-up of abdomen of male E. divisa with ear-like structure at base of surstyli usually visible on intact specimen; 6 — surstyli of E. cucularia caudal and lateral; 7 — surstyli of E. solicita caudal and lateral; 8 — surstyli of E. divisa caudal (two projections) and lateral; bs — butterfly-like dark spot near apex of R2+3; els — ear-like structure at base of surstyli Рис. 3–8. Elgiva: 3 — крыΛо E. solicita c темным пятном в виΑе бабочки у конца R2+3; 4 — E. divisa, самец; 5 — брюшко самца E. divisa с ушковиΑным выступом в основании сурстиΛей,обычно хорошо заметным у непрепарированных экземпΛяров; 6 — сурстиΛи E. cucularia сзаΑи и сбоку; 7 — сурстиΛи E. solicita сзаΑи и сбоку; 8 — сурстиΛи E. divisa сзаΑи (с Αвух ракурсов) и сбоку; bs — пятно в виΑе бабочки у конца R2+3; els — ушковиΑное взΑутие в основании сурстиΛей