Peruvian Darwin wasps of the genus Dolichomitus Smith, 1877 (Hymenoptera: Ichneumonidae), with a key to Neotropical species.

Dolichomitus is a moderately large genus comprising 87 known species, 21 of which occur in the Neotropical region. Here, eight new species from Peru are described and figured: D. chetsorr Inga & Alvarado, sp. nov., D. illa Inga & Alvarado, sp. nov., D. maquinaccasa Inga & Alvarado, sp. nov., D. puka Inga & Alvarado, sp. nov., D. quellue Inga & Alvarado, sp. nov., D. yanasiki Inga & Alvarado, sp. nov., D. urqu Inga & Alvarado, sp. nov., and D. willapi Inga & Alvarado, sp. nov.. Dolichomitus annulicornis (Cameron) and D. meii Di Giovanni & Sääksjärvi are recorded from Peru for first time. Furthermore, Umanella tricoloripes Herrera-Florez is transferred to Dolichomitus, and D. pimmi Araujo & Pádua is synonymized with D. tricoloripes (Herrera-Florez, 2018); and a key to Neotropical species is provided.