Review and key to Nearctic Lathrolestes Förster (Hymenoptera: Ichneumonidae), with special reference to species attacking leaf mining tenthredinid sawflies in Betula Linnaeus (Betulaceae) Author Reshchikov, Alexey V. Author Soper, Anna Author Van, Roy G. text Zootaxa 2010 2614 1 17 journal article 10.5281/zenodo.197875 37700ed7-18f8-43ef-9252-c3ea87907bc2 1175-5326 197875 Lathrolestes caudatus (Thomson, 1883) Lathrolestus caudatus, Thomson, 1883 , type lost. Lathrolestus pleuralis Thomson, 1883 . ex. syn.; Hinz, 1996. Lathrolestus nasoni Davis, 1897 , Holotype , male, Algonquin, IL , (ANSP) syn. nov. Lathrolestus similis Davis, 1897 , Holotype , female, Colorado, (ANSP); Barron, 1994 ; Aubert, 2000 . In regards its main character states, the holotype of L. nasoni Davis, 1897 is fully similar to L. caudatus (Thomson, 1883) . Consequently, L. nasoni Davis, 1897 is proposed as a new junior synonym for L. caudatus (Thomson, 1883) . Ovipositors of both these taxa are long, slightly curved up, with apical teeth. There is a slight difference in coloration in Nearctic and Palearctic specimens: Nearctic individuals have reddish-brown clypeus; propodeum varying from black to reddish-brown; Palearctic specimens with black clypeus and propodeum. This species was recorded as parasitoid of Ardis brunniventris (Hartig, 1837) on Rosa rugosa in Europe ( Evenhuis, 1973 ).