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This wasp is only known from Suffolk in Great Britain, where it was discovered new to Britain in 2003. The BMNH has specimens of M. bicolor from France, Spain, Austria, Switzerland, Greece, Cyprus, Israel,Turkey, Bulgaria and Sicily. Bitsch et al. (2001) add Iran, Syria and Kazakhstan, whilst Dollfuss (1991) notes its presence also in North Africa, from Algeria. Bitsch et al. (2001) show the species to be quite widely distributed across France.