Systenus Loew 1857

Key to species of Systenus from Colombia (males) 1 Metepimeron dark (e.g. Figs 1A, 2A); abdominal tergites 1–3 mostly metallic green (e.g. Figs 1E, 2E).................. 3 - Metepimeron yellow (Figs 5C, 6A); abdominal tergites 1–3 partly yellow (Figs 5C, 6A)............................. 2 2 Femur III entirely yellow (Fig. 5C); abdominal tergite 3 dorsally metallic green, tergites 4–5 wholly metallic green (Fig. 5C); surstylus slightly curved ventrally at apex (Fig. 5D)............................................ S. flaviatus Naglis - Femur III yellow with dark brown apex (Fig. 6A); abdominal tergite 3 mostly yellow (Fig. 6A), with T-shaped macula dorsally, tergites 4–5 dark brown; surstylus abruptly curved ventrally at apex (Fig. 6B)..................... S. naranjensis Bickel 3 Antenna wholly dark brown (Fig. 3A, B); femora mostly dark brown (Fig. 3A)....................... S. fuscus sp. nov. - Antenna partly orangish yellow (Figs 1B, 2B, 4B); femora yellow (Figs 2A, 4A)................................... 4 4 It 3 white (Fig. 5E); wing apex brown: posterior wing membrane reduced near apex, with vein M 1 ending on posterior margin (Fig. 5E)........................................................................... S. maculipennis Bickel - It 3 yellow (Figs 2A, 4A); wing apex unmodified, membrane hyaline or brownish (Figs 1D, 2D)....................... 5 5 Postpedicel wholly orangish yellow at basal 1/2 (Fig. 6C); abdominal segment 7 forming peduncle shorter than epandrial capsule (Fig. 6C); cercus rectangular, shorter than epandrial capsule (Fig. 6D)......................... S. parkeri Bickel - Postpedicel partly brownish at basal 1/2 (Figs 1B, 2B, 4B); abdominal segment 7 forming peduncle longer than epandrial capsule (Figs 1A, 2A, 4A); cercus digitiform, as long or longer than epandrial capsule (Figs 1F, 2F, 4F)................. 6 6 Palpus mostly brown (Fig. 1B); wing membrane light brown (Fig. 1D); cercus about 2X longer than epandrial capsule (Fig. 1F).................................................................................... S. bickeli sp. nov. - Palpus yellow (Fig. 2B); wing membrane hyaline (Fig. 2D); cercus as long or only slightly longer than epandrial capsule (Figs 2F, 4F)......................................................................................... 7 7 Surstylus longer than cercus and epandrial capsule, ventral edge nearly straight, only slightly narrowed and curved ventrally at apex (Fig. 5B)............................................................................ S. beatae Naglis - Surstylus shorter or as long as cercus and epandrial capsule and abruptly narrowed towards apex (Figs 2F, 4F)........... 8 8 Coxa III mostly yellow (Fig. 4A); surstylus as long as cercus, wide, abruptly narrowed at apex, with 1 basodorsal acute process (Fig. 4F, G)............................................................................ S. grossus sp. nov. - Coxa III mostly brown (Fig. 2A); surstylus shorter than cercus, narrow, slightly narrowed at apex, with 1 basodorsal acute process and 1 apicoventral acute process (Fig. 2F)......................................... S. colombiensis sp. nov.