Clinging to barren twig of desert lavender. Also posted to BugGuide: https://bugguide.net/node/view/1950191.
Appears to be laying eggs on flower buds (see photo #5)--observed on Baileya multiradiata (desert marigold) and Salvia mellifera (black sage) at the California Botanic Garden
Thought at first it was a hymenopteran, then got a look at those cool antennae :-)