Download high resolution image here.

This is an Asphondylia neomexicana gall midge larva with a parasite I'd like ID'ed attached to the left flank of its abdomen. I excised it from a woolly gall on a Atriplex canescens (fourwing saltbush) at 35°08'10.4"N 106°28'48.9"W, 6128 ft, Sandia Crest 7.5’ quadrangle, near the trailhead of Embudito Trl (192) in the Sandia Mountains, Bernalillo Co, NM. The bush and its gall occupants are described here:
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Various species of parasitoid and inquiline wasps emerged over the next few weeks from branches kept in water at room temperature, so that was my first guess. However, the parasite does not resemble the larvae of such that I've found posted on BG. Most conspicuously, segmentation is indistinct. It has setae, though, so it does not appear to be a cocoon or other constructed covering. I removed the parasite and linked a ventral view, in case that helps identify it.

This specimen was soaked in ethanol, then acetone, then HMDS(1) for at least 24 hrs. each, then rapidly dried with the intense light of a 250W dual fiber optic microscope illuminator to prevent shrivel.

This image is from a Helicon Focus processed stack of 319 images with a 3.1 µm step taken with a Mitutoyo BD Plan APO 20X/0.42 ∞/0 mm microscope objective + Nikon 135 mm F2.8 AIS telephoto lens + Nikon D810 camera (magnification 13.5×; technique described here).