Review of Nearctic genera of Euderinae (Hymenoptera: Eulophidae), with descriptions of two new species of Allocerastichus Masi, and redescription of Carlyleia marilandica Girault
Nearctic genera of Euderinae (Hymenoptera: Eulophidae) are reviewed, and diagnostic characters of the subfamily are discussed. Six genera, Acrias, Allocerastichus, Astichus, Carlyleia, Euderus, and Hubbardiella, are recognized from the Nearctic region. Notes are provided on nomenclature, taxonomy, geographic distribution, and natural history for each genus. Six generic names are placed in synonymy: Moureisca De Santis, Urban, &Graf, Balinia Hedqvist, Durinia Hedqvist, and Oinia Hedqvist as junior synonyms of Acrias, and Cortesiella De Santis and Gimlia Hedqvist as junior synonyms of Allocerastichus. Two specific names are placed in synonymy: Astichus (Astichus) notus Yoshimoto as a junior synonym of A. (A.) polyporicola Hedqvist and Euderus (Euderus) viridilineatus Yoshimoto as a junior synonym of E. (E.) verticillatus (Ashmead). The genus Allocerastichus is recorded from the Nearctic region for the first time, based on A. bicarinatus sp.nov. (type locality: Louisa County, Virginia, U.S.A.) and A. tricarinatus sp.nov. (type locality: Jackson County, North Carolina, U.S.A.). The female of Carlyleia marilandica Girault is redescribed, and the male is described for the first time. Two subgenera of Euderus are recognized: Euderus s.str. and Euderus (Secodelloidea). The genus Parasecodella, represented in the New World by an undescribed Nearctic species, is probably synonymous with Euderus; it may constitute a third subgenus. Further examination of species of Parasecodella and Euderus s.l. should be done before such a classification is made. The difficulty of recognizing Hubbardiella as a euderine, based on the number of distinct metasomal tergites, is discussed.