Checklist of British and Irish Hymenoptera - Ichneumonidae Author Broad, Gavin R. text Biodiversity Data Journal 2016 4 9042 9042 http://dx.doi.org/10.3897/BDJ.4.e9042 journal article http://dx.doi.org/10.3897/BDJ.4.e9042 1314-2828--9042 Anisotacrus tenellus (Holmgren, 1857) Mesoleius tenellus Holmgren, 1857 Distribution England, Scotland Notes BMNH, NMS added here; treated as a synonym of bipunctatus by Aubert (2000) but as a valid species in Yu and Horstmann (1997) .