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Very nice :) I would guess that these are from the genus Zelia - a common genus across South America with many undescribed species and no keys available to identify them ;)

The best thing to do is to lodge them (with host data) with me or Monty Wood and at the very minimum we will make them available to workers that want to take on the genus and revise it. :)

I have loads of specimens of Zelia spp. here waiting for a key to become available. The BMNH collection hasn't been much help either because a large proportion of their specimens are awaiting description/identification. It is important to preserve the host remains or at least the identification of the host because this might be critical in helping to sort out the taxonomy.