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Abstract
The Nearctic species of Heterischnus Wesmael are revised. Redescriptions are provided of the three known species, H. bicolorator, H. huardi and H. coloradensis. Heterischnus mexicanussp. nov. is newly described and H. bicolorator is recorded for the first time from the Nearctic region. The first key to the Nearctic species is provided along with species images and distribution maps.
Highlights
Heterischnus Wesmael (Hymenoptera: Ichneumonidae: Ichneumoninae) is a morphologically well-defined genus in the tribe Phaeogenini and is comprised of 30 described species in the Holarctic and Afrotropical regions (Yu et al 2016)
Heterischnus was formerly placed in the subtribe Heterischina (Diller 1981; Selfa and Diller 1994)
Females are described in full, while only deviations in structure and color are noted for males
Summary
Heterischnus Wesmael (Hymenoptera: Ichneumonidae: Ichneumoninae) is a morphologically well-defined genus in the tribe Phaeogenini and is comprised of 30 described species in the Holarctic and Afrotropical regions (Yu et al 2016). Heterischnus was formerly placed in the subtribe Heterischina (Diller 1981; Selfa and Diller 1994). Santos et al (2021) found that the majority of the Phaeogenini subtribes were non-monophyletic and are not recognized here. Heterischnus species are parasitoids of microlepidoptera, especially Pterophoridae (Bragg 1970; Sedivy 1986; Diller and Shaw 2014). Rearing records from other groups, such as noctuids
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