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Netted, briefly chilled, photographed, and released unharmed onto Phacelia after it revived.

Note the relatively small & widely-spaced eyes. That together with the relatively short antennae (for Adela) would usually suggest a female...but the constant fluttering without landing within the creosote stems suggested something along the lines of male lekking behavior. At this point it's not clear to me whether this species conforms to the "small, well-separated eyes & shorter antennae ⇒ female" rule that applies to many other Adela species.

For further info, see remarks under 1st image in this series.