Key to the subgenera of the genus Sirthenea 1 Scape surpassing apex of head (Figs. 28, 153), sulci of anterior pronotal lobe barely visible and not completely developed, legs long and slender (Figs. 28, 131)................................................ Monogmus Horváth, 1909 - Scape at most reaching apex of head (Fig. 15), sulci of anterior pronotal lobe distinct and fully developed (Fig. 155), legs short and robust........................................................................ Sirthenea s. str.

Published as part of Chłond, Dominik, 2018, A taxonomic revision of the genus Sirthenea (Hemiptera: Heteroptera: Reduviidae) of the Old World, pp. 1-85 in Zootaxa 4520 (1) on page 8, DOI: 10.11646/zootaxa.4520.1.1, http://zenodo.org/record/2609576