On one of the roof beams inside my study a little ‘ant’ of ±34-4 mm was crawling about, which promptly dropped down. As I picked it up and took a closer look I noticed an ovipositor sticking out… so not ant but a femal wasp, but also no wings… interesting!
Immediately started a photosession to shine a light on this new visitor.


After some digging on the web it turns out that the number of wingless (apterous) ichneumon wasp genera are limited to [1]:
- Gelis
- Polyaulon
- Thaumatogelis
After identification using the Gelis key I think it is a specimen Gelis bicolor [2]. As this is the first time that I’ve observed the genus I felt like validating this with the experts on the Waarneming.nl forum, which eventually lead to a mail to the author of the key, expert Dr. Martin Schwarz. His verdict: Gelis bicolor.
See here for the identification of the specimen.
The females of the species overwinter so she should be outside. However currently it is freezing and there is a thick cover of snow, not ideal to be evicted. So I’ve decided to make it into a breeding challenge to see if she can be kept alive until warmer weather returns, which should be within a week or so.
She is now housed in a little jar and is fed sugar water on daily, which she eagerly consumes. Up to now things are looking good.

UPDATE: 2021/02/20
Looking at the nice weather and higher temperatures I decided to release the wasp and set her free on young Stinging nettles.


Literature
1 Schwarz M., 1995. Revision der westpaläarktischen Arten der Gattung Gelis THUNBERG mit apteren Weibchen und Thaumatogelis SCHIEDEKNECHT (Hymenoptera, Ichneumonidae). Teil 1. – Linzer biologische Beiträge – 0027_1: 5 - 105.2 Nederlands Soortenregister
3 reference not found