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I think that this isn't a species of Neoitamus. There are two other genera, which have bigger species, in the Mediterranean region: Astochia and Promachus. Unfortunately, there are no records from Spain from both. Promachus is widely distributed (also on the Canary Islands), but unknown to Spain. Usually, robber flies are common and therefore you have to collect some specimens and send them to a specialist. The fauna of the Iberian peninsula is insufficient revised. Yours