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The separation of the species within the genus, especially between pendulus and triittatus also puzzled me. After looking through many IDed images, it appears to me that the best feature is the top of the second abdominal segment. The two small spots in the middle are more pronounced and often have a different colour in pendulus. What other features separate the two species? Am I right that this is a reliable feature?

H. pendulus is much scarcer around here in Hungary, than trivittatus. I have not seen any other species in that genus.