Thanks, Richard. After obtaining your ID, I noticed that rubber rabbitbrush (i.e. Chrysothamnus, which has recently been subsumed under Ericameria) was associated with A. walsinghami in every reference I could find (e.g. Evans & Hogue, as well as here, and elsewhere). And Chrysothamnus appears in all but one of the current BG posts, which is a museum specimen that was collected not far from Mt. Pinos.

PS: I just noticed this last image in my series is indicated as a female. Just wondering if I inadventently clicked the "Female" check box while editing it, or whether you noted this was a female and made the edit when you ID'd the post. I don't know how to distinguish male from female here.

Ooops, that would be me that hit the wrong box! I just fixed it. You have a male. Thanks for calling this goof to my attention.

...and good timing, I was just editing the info page regarding color dimorphism among males and females of this species, after searching out and reading the description in Fisher (1928). You may want to check out the info page to make sure I got things right. (In particular, I couldn't find any reference stating categorically that Chrysothamnus is the actual larval host or adult food plant...just that A. walsinghami is typically found on that plant.)

The info. page is fine. This species is consistently associated with rubber rabbitbrush, so much so that the plant can be assumed to be its host. The reference by Nelson et al. mentions willow, but that would be simply an incidental resting place.