Capsus modestus Meyer-Dür, 1843: 69. STS: Switzerland, Gyrisberg nr Burgdorf; lost? (Kerzhner, 1996b: 268).
Capsus gracilicornis Scholtz, 1847: 139 (syn. Fieber, 1861a: 394). STS: Poland, Kratzbusch nr Breslau [= Wrocław]; UWCP?
Capsus atropurpureus Kirschbaum, 1856: 262, 338 (syn. Baerensprung, 1860: 17). STS: female, Germany, Wiesbaden; MWNH.
Sthenarus modestus f. purpurascens Stichel, 1956b: 366.