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The monster below got into my house today (west of Paris, France). It is about 3 cm (1.2 inches) long.

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I have no idea if this is a local insect that I would then let free, or some invasive species I will kill (we have from time to time alerts about invasive insect species (especially mosquitoes) that put in danger the local ones)

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  • $\begingroup$ Incidentally it looks like it has a couple of parasitic mites on its legs $\endgroup$
    – bob1
    Jun 2 at 21:09
  • $\begingroup$ @bob1: ah, I thought that was dust (she spent sometime in the house) $\endgroup$
    – WoJ
    Jun 3 at 5:39
  • $\begingroup$ I don't think those are parasitic mites - I think they are pseudoscorpions - maybe hitching a ride to new homes? $\endgroup$ Aug 9 at 21:42
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I have no expertise in (French) insects, but this looks like it might be a crane fly (family: Tipulidae) in the genus Ctenophora. The larvae of these flies feed on decaying wood, so a lack of (partially) dead trees or other dead wood in your vicinity would suggest this is not correct.

The hunched-back with long legs are suggestive of the crane-fly family and the V-shaped groove on the back more-or-less connecting the wing-bases is (according to the wikipedia article) characteristic of this family.

In particular, this looks quite similar to many pictures online of the Cone-horn cranefly (Ctenophora pectinicornis), which is found in your area

Ctenophora pectinicornis Image by Margaret McLoughlin.

My understanding is that the simple antennae indicate that this is a female — males have feathery antennae.

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    $\begingroup$ Crane fly was my thought too. Looks like a case of mimicry with a wasp/bee as well. $\endgroup$
    – bob1
    Jun 2 at 21:08

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