Trigonalys erythrocephala Santos et Aguiar, sp. n. Holotype female. 3 Lateral habitus (Morphobank accession number M90448) 4 Head, antero-ventral (M90449) 5 Head, antero-dorsal, to show ocelli (M90450) 6 Head, dorsal (M90451) 7 Mesothorax, dorsal (M90452) 8 Propodeum and base of petiole, dorsal (M90453) 9 Apical segments of metasoma, latero-ventral, left, showing metasomal armature and ovipositor; arrow indicates position of longitudinal carina (M90454) 10 Pronotum, left (M90455) 11 Left hind coxa, to show lateral longitudinal carinae (arrows) and dorso-mesal strigation (M90456) 12 Apical tergites, to show abnormal development of tergites (M90457).