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Ok, I am not a specialist in Dasyhelea that is why I wrote “probably Dasyhelea flavifrons” :). I know that larvae of Ceratopogonidae, Anisopodidae, Mycetobiidae, Dolichopodidae, Muscidae, Aulacigastridae, Syrphidae etc. live in a sap running down from trees. If I remember correctly, the larvae of Anisopodidae and Mycetobiidae have a number of supplementary segments, don’t they? This larva looks like ceratopogonid. Among the biting midges some species of the genus Culicoides and Dasyhelea are known from this kind of habitat. I have reared thousands of biting midges from larvae collected with sap and I have had specimens belonging to the booth genera. Because of the larvae of Culicoides usually have a short neck segment and a characteristic pattern on the thoracic segments, I suppose that this one is a Dasyhelea larva. There is known only one species of Dasyhelea midges from sap - D. flavifrons. Of course, there is a probability that this is the larva of Culicoides which does not possess pigmented spots:) It will be necessary to kill the larva in hot water and to find the posterior hooks in order to be absolutely sure:).
Regards,
Patrycja