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Many thanks Gabor. You are certainly correct. I had never heard of Macrocera, nor even of Keroplatidae, so I doubly appreciate your assistance.
I was amused and slightly consoled to see that some other entomologists had gone down the same path: Ah! Ichneumo... oops! Halteres... Tipulidae... noooo...

Oh well, it is all education! Thanks again. |t