Thyanta (Argosoma) humilis Bergroth, 1891 (Figs 104–106) Pentatoma patruelis Stål, 1859: 226. Preoccupied. Thyanta patruelis Berg, 1878: 23; Torre-Bueno 1915: 161. Thyanta (Argosoma) humilis Bergroth, 1891: 225. Thyanta (Argosoma) patruelis Rider & Chapin, 1991: 37. Material studied. Maquiné: 1♀, Garapiá-varredura, 21.XII. 2006, R. C. Bins-Neto & L. M. Weiler, LES–926; 1♀, Trilha 5, guarda-chuva, 03.IV.2006, J. L. C. Bernardes leg., LES –925, J. Grazia det. 2006 (UFRG); 1♀, Trilha 4, 02.IV.2006, J. L. C. Bernardes leg., LES–922, J. Grazia det. 2006 (UFRG). Santa Maria: 1♀, 26.IV.1987, D. Link leg., “Erva de bicho” (UFRG). Diagnostic features. Body dorsal and ventral surfaces green to castaneous. Red macule on dorsal median area of head and apex of scutellum (Fig. 104). Mandibular plates subequal to clypeus and rounded apically (Fig. 105). Pronotum with a red to purple transumeral band (Fig. 104). Anterolateral margins of pronotum straight to slightly concave (Figs 104–105). Humeral angles slightly developed, rounded apically (Fig. 105). Body length: 7.50–9.50 mm (Garbelotto & Campos 2014). Recorded host plants. Canola (Marsaro Jr. et al. 2017; Bianchi et al. 2019). Distribution in Rio Grande do Sul. Maquiné, Passo Fundo and Santa Maria (Fig. 106). New records. Maquiné and Santa Maria.

Published as part of Barros, Lurdiana D., Paim, Marcelo R., Krein, Verônica, Carabajal, Victor, Brandão, Marcela N., Bernardes, Paula De O. & Lindner, Mariana F., 2021, Illustrated guide to Pentatominae (Hemiptera: Pentatomidae) species associated with the four main grain crops in Rio Grande do Sul state, Brazil, pp. 430-478 in Zootaxa 4958 (1) on pages 466-467, DOI: 10.11646/zootaxa.4958.1.27, http://zenodo.org/record/4692176