Females of Diphyus quadripunctorius (Müller, 1776) hibernating in a limestone cave in the Netherlands, Maastricht (Sint-Pietersberg), 4 December 2019. Willem Vergoossen.

 
 
  Part of: Verheyde F, Quicke DLJ (2022) Review of adult diapause in ichneumonid wasps (Hymenoptera, Ichneumonidae). Journal of Hymenoptera Research 91: 185-208. https://doi.org/10.3897/jhr.91.83618