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The palps are short (so not Anopheles). The anal vein is straight (so not Uranotaenia). The abdomen is blunt-ended, with no sign of the cerci (so not Aedes or Ochlerotatus). The wing scales are narrow (so not Coquillettidia). There are no white rings on the tarsi (so not Orthopodomyia, nor most Culiseta). Two species of European Culiseta have unbanded legs, but neither looks like your specimen, and they live in mountains or tundra, so unlikely to occur in Toulouse. We're just left with Culex. :)