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A bit more info:

The fly does have the expected characteristics of D. criniventris: it is largish (Hylemya vagans size), has distinctly yellowish hind tibiae, and there are long hairs on the lateral edges of tergite 3 which curl down and backwards under the tip of the abdomen.

It is only the backward-pointing triangular 'teeth' on the cerci that stop me from marking it as criniventris and moving on.

In the images in Ackland's draft key I can find no species with long cerci that have such 'teeth'.