Project 551: B. F. Santos, A. P. Aguiar, A. M. Tedesco. 2012. Trigonalidae (Hymenoptera) from cacao agroforestry systems in northeastern Brazil, with two new species of Trigonalys Westwood. Journal of Hymenoptera Research. 25:19-34.
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Habitus
Head, dorsal
Head, frons
Head, frontal
Hind coxa, left