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Photo#1586813
Diptera, Equisetum - Bradysia giraudii

Diptera, Equisetum - Bradysia giraudii
Cherry Creek Falls Trail, King County, Washington, USA
August 31, 2018
Yellowish body, brownish head capsule (with a distinctive posterior margin), internal feeding habit...this reminds me more than a bit of Phytosciara per Charley's recent blog post, but I'm not going to claim it's that. However, it sure does look like some kind of sciarid to me.

Host is an Equisetum. When I first found the larva it was feeding at one of the joints/nodes in the plant stem, in an area discolored by feeding/decay and filled with wet black frass -- as shown in the first two images in this series. (Only an inch or two above the larva, the plant's top had fallen off -- and the truncated stem with the discolored end is what had caught my attention in the first place.) But, in the next few days in my rearing container, the larva seemed more interested in dwelling and feeding within the channels of the horsetail stem (as shown in the later images in this series); in fact it seemed quite adept at living in this microhabitat.

See also:
Chloropidae in another, similarly damaged horsetail stem:

Images of this individual: tag all
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Moved

 
Thanks very much, Charley!
Great to have a page for this on Bugguide and the ID from Kai.

Moved
Moved from Flies.

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