Key to the species of Paraxenopygus

1. Head and pronotum bright metallic black-blue or dull grey-black with blue overtones (Figure 2A–B); abdominal tergites 3–4 with a faint curved line posterior to anterior transverse basal line (Figure 4H) ................................................................................................... 2

- Head and pronotum shining metallic green to metallic bronze (Figure 2C–D); abdominal tergites 3–4 without a faint curved line posterior to anterior transverse basal line ......... 3

2. Antennomeres 1–5 without tomentose pubescence (Figure 4F); head and pronotum bright metallic black-blue (Figure 2A); pronotum with clearly separated rows of setose punctures (Figure 2A); metacoxal shield elongate and narrow (Figure 3A); paramere slightly longer and narrower than median lobe (except apically) (Figure 5A); and median lobe in lateral view becoming narrower, with thin apex (Figure 5C) ................... .............................................................................................. Paraxenopygus tremolerasi Bernhauer

- Antennomeres 1–4 without tomentose pubescence (Figure 4G); head and pronotum dull grey-black with blue overtones (Figure 2B); pronotum with rows of setose punctures confused and nearly becoming evenly distributed (Figure 2B); metacoxal shield short and wide (Figure 3B); paramere shorter and much narrower than median lobe (Figure 5D); and median lobe in lateral view becoming narrower only near apex (Figure 5F) .......... .......... P. maurocyanos Chatzimanolis, Brunke and Navarrete-Heredia

3. Head and pronotum metallic bronze (Figure 2E); abdominal tergites each with large median and smaller lateral dark spots (Figure 1E) ........ ........ P. opacipennis Bernhauer

- Head and pronotum metallic green (Figure 2C–D); abdominal tergites 3–5 with dark spots as above; typically abdomen orange-brown but some specimens can be darker (Figure 1C–D) ......................................................................................................................................... 4

4. Pronotum with sparse setose punctures in discrete rows (Figure 2D); tergite 7 with dark median spot (Figure 1D); aedeagus much smaller than in other species (Figure 5J–L); apex of median lobe in ventral view broadly rounded (Figure 5J); median lobe in lateral view without subapical tooth (Figure 5L) .......................................... ....................................................... P. newtoni Chatzimanolis, Brunke and Navarrete-Heredia

- Pronotum with dense setose punctures in confused rows, nearly evenly distributed (Figure 2C); tergite 7 with dark median band (Figure 1C); aedeagus similarly sized to most species (Figure 5G–I); apex of median lobe in ventral view converging to narrow rounded tip (Figure 5G); median lobe in lateral view with subapical tooth (Figure 5I) ........................................................................................................................ P. peruvianus Bernhauer