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For Italian Culicdiae, you could try Severini, Francesco & Toma, Luciano & Di Luca, Marco & Romi, Roberto. (2009). Le zanzare italiane: Generalità e identificazione degli adulti (Diptera, Culicidae). Fragmenta Entomologica. 41. 213 - 372. (available at http://www.fragme...view/92/84 )
For European keys and descriptions. I use Becker, N., Petric, D., Zgomba, M., Boase, C., Madon, M.B., Dahl, C., Kaiser, A. 2010. Mosquitoes and Their Control. Springer-Verlag Berlin Heidelberg. I believe there is a new edition published this year, so you may be able to get a used copy of this 2010 edition cheaply.