Trogus is a genus of parasitoid wasp found in the Holarctic and Neotropic regions.

[4] Trogus species are parasites of larvae and pupae of the swallowtail butterfly family, Papilionidae.

The generic name Trogus comes from the ancient Greek word τρώγω (trṓgō) meaning "to gnaw" or "to nibble".

[5][6][7] German entomologist Georg Wolfgang Franz Panzer created the genus Trogus in 1806.

[13][2] The generic name Dinotomus comes from the ancient Greek words δεινός (deinós; "strange") and τομή (tomḗ; "segment").

[20] In 2021, Santos and colleagues synonymized the tribe Heresiarchini under Ichneumonini and demonstrated that the Trogus subgroup did not nest within the Callajoppa group.

Their abdomens resemble a row of rectangular blocks due to each abdominal segment having thick edges and deep cuts.

[2]: 584  Sime and Wahl, in part following Gerd Heinrich, proposed Trogus originated in the Palaearctic and crossed into North America following ancestors of the Papilio machaon clade over Beringia.

[20][27] Trogus species make their emergence hole by secreting a fluid which softens the pupa cuticle.