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Indeed it was in the step that separates E. cristata from the other species that my doubts arouse. According to the key E. cristata has 4 bristles on the postpronotum, with the three strongest arranged in a more or less straight line. In my specimen I count 5 bristles, and I'm not sure if I should consider that the strongest are in a straight line or not, it seems somewhat intermediate. But because of the 5 bristles on the postpronotum I continued in the key and reached E. microcera.