A New Genus and Two New Species of the Subfamily Nesomesochorinae Ashmead (Insecta: Hymenoptera: Ichneumonidae)

Abstract

Nesomesochorinae is a rather small subfamily of Darwin wasps (Insecta: Hymenoptera: Ichneumonidae), only with three described genera. We recognize a fourth nesomesochorine genus from Perú and describe it as a new genus, Bina Shimizu & Alvarado gen. nov. The new genus is distinguished from previously described genera of Nesomesochorinae by the following combination of character states: mandible parallel-sided proximally and abruptly strongly narrowed ventroapically so that its lower apical tooth is much smaller and sharper than upper tooth; propodeum with lateromedian longitudinal carinae between anterior and posterior transverse carinae developed on more than posterior 0.9 so that the area superomedia is more or less enclosed; thyridium of 2nd metasomal tergite sometimes very large; 1st metasomal tergite stout and arched; body highly shiny. Bina gen. nov. comprises two species also described as new to science: B. huayrurae Shimizu & Alvarado sp. nov. (type species of Bina gen. nov.) and B. nigra Shimizu & Alvarado sp. nov. Identification keys to genera of Nesomesochorinae and to species of Bina gen. nov. are provided.

Nonnus niger (Brullé, 1846) (Hymenoptera: Ichneumonidae: Nesomesochorinae) in eastern Uruguay: new records and comments about phenology

“…Nesomesochorinae is a very small subfamily of Darwin wasps, having only four genera: Bina Shimizu & Alvarado, 2020, Chriodes Förster, 1869, Klutiana Betrem, 1932 and Nonnus Cresson, 1874, totaling 62 described species (Yu et al 2016;Shimizu & Alvarado 2020).…”

“…To date, their biology is unknown, but it is believed that they are possibly koinobiont endoparasitoids of Lepidoptera larvae (Shimizu & Alvarado 2020). Its distribution is more abundant in the tropics and known in the Afrotropical, Palearctic, Eastern and Neotropical regions (Yu et al 2016).…”