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Elgiva sp. for sure. It has a relatively long last segment which could also be seen in your first photo and in 0:21 sec. in your video I see 2 small fused ventral anal lobes, so it definitely Elgiva. To be sure about the species name (cucularia=rare, solicita=common) you need to study the number of lobes in the anterior spiracle. However solicita is very common as larva and I have seen cucularia only once (as a pupa: http://www.dipter...to_id=6591)