Key to tribes of Neurigoninae and genera of Neotropical Neurigonini (modified from Naglis 2003)

1 Thorax strongly elongated (Naglis 2001a, figs 3A, C); abdomen about as long as thorax and dorsoventrally flattened; vertex excavated dorsally between vt s and ocellar tubercle; male It5 with ventral comb of short blunt spines (Naglis 2001a, fig. 3D); arista subapical (Naglis 2001a, fig. 1B); surstylus with one single lobe (Naglis 2001a, figs 1E, 2C, 3G)........ Coeloglutini

– Thorax not elongated (Figs 1A, 3C); abdomen usually about 1.3–1.5 times longer than thorax and not dorsoventrally flattened; vertex not excavated (Figs 1B, 3B); male It5 without ventral comb of short spines; arista usually dorsal (Fig. 1C); surstylus divided into dorsal and ventral lobes (Fig. 2A–D)........................................................... 2

2 Thorax usually metallic green (except Naglisia, with thorax yellow); dc s consisting of 2–3 pairs of setae (except Argentinia Parent, with 6–7 pairs); wing vein M S-shaped, joining costa distinctly anteriad of apex close to vein R 4+5, with distance between R 4+5 and M 1 at costa usually less than half-length of crossvein dm-m; legs usually without major setae on tibia II and/or tibia III; female oviscapt with tergites 9+10 blunt and rounded, with sternite 10 (“cercus” in Naglis’ terminology) free from tergite 9+10 (Quevedo et al. 2025, fig. 2A–E)................................................... Dactylomyiini

– Thorax metallic green or yellow; dc s consisting of 5–7 pairs of setae; wing vein M 1 usually straight or bent, joining costa at apex or posteriad of apex, with distance between R 4+5 and M 1 at costa usually more than half-length of crossvein dm-m (except Mberu, Figs 4F, 5G, 6F); legs usually with major setae on tibia II and/or tibia III; female oviscapt with tergites 9+10 elongate and tapered, with sternite 10 fused with tergite 9+10 (Fig. 22B, C) … Neurigonini .................................. 3

3 Male abdominal segment 5 with long sickle-shaped ventral projection covering entire ventral border of hypopygium (Naglis 2002a, fig. 3A); hypopygium large and at base remarkably projecting above dorsum of abdomen (Naglis 2002a, fig. 3A); male coxa II with ventral lobe bearing long sinuate or flattened setae (Naglis 2002a, fig. 3A, B); male It4+5 broadened and pennate bilaterally (Naglis 2002a, figs 3A, 5A); phallus divided into two arms with multi-furcate tip.......... Bickelomyia Naglis

– Male abdominal segment 5 with or without ventral projection, if present then not sickle-shaped and only partially covering ventral border of hypopygium; hypopygium at base not projecting above dorsum of abdomen; male coxa II unmodified; male It4+5 rarely pennate; phallus usually present as single arm with pointed tip....................................... 4

4 Postpedicel triangular, with acute apex (Figs 1C, 5C, 6C, 16C, 20C); costal section between R 4+5 and M 1 shorter than half-length of crossvein dm-m, M 1 ending anterior to wing apex (Figs 1F, 4F, 5G); It1–5 with ventral surface entirely bare (Fig. 5F); female tergite 9+10 with 4–6 spines at apex (Fig. 22B, C, D; Capellari & Amorim 2011, figs 8, 9)..... Mberu Capellari & Amorim

– Postpedicel subtriangular, with rounded apex; costal section between R 4+5 and M 1 usually longer than half-length of crossvein dm-m, M 1 ending at or posteriad to wing apex (Naglis 2003, fig. 1A); It1–5 covered by setae on ventral surface; female tergite 9+10 without spines at apex............................................................................ 5

5 Thorax entirely metallic green; abdomen metallic bronze-green with segments 1 and 2 often yellow; tibia II usually with only 1–2 ad setae; IIt1 devoid of major setae; proboscis without pair of long ventral hairs; male It4 usually dorsoventrally flattened, with ventral pile; male cercus often elongated, with modified setation.............................. Viridigona Naglis

– Thorax mainly ochreous-yellow, metallic green at most on mesonotal depression and scutellum, or sometimes dark brown, with or without dense pruinosity; abdomen ochreous-yellow, usually with dark tergal bands; tibia II usually with ad, pd and ventral setae; IIt1 usually with strong posterior seta basally and additional strong setae; proboscis with pair of long sinuous ventral hairs; male It4 not modified; if modified, not dorsoventrally flattened with ventral pile; male cercus short and rounded, with short setae........................................................................... Neurigona Rondani