Found a short time before this shot by Joyce Gross, while it was camouflaged within the needles of a Gray Pine (Pinus sabiniana). At this point it had wandered onto a branch (trying to flee the attention of us photographers).

This appears to be a nymph of Timema californicum. My guess is that it's a male from: the dorso-ventral flattening of the cerci (vs. more rounded and apically tapering in females); their somewhat separated position (vs. held touching in females); and the slightly wider appearance of the right "cercus" (which I suspect is actually both the developing left cercus and interdextral process...tightly appressed).

Note that Pinus sabiniana (and pines in general) are not recorded as hosts plants for T. californicum. I figure the primary business of immature instars is feeding, not dispersal...so sightings like this seem somewhat puzzling to me (unless it's presence on the pine was accidental...e.g. via falling off an adjacent host plant).

PS: Of late, I'm trying to count antennal segments of Timema in photos to see if any consistent patterns arise (e.g. correlating to nymphs vs. adults, males vs. females, etc.). Using the full-size image here, I count 19 antennal segments on its left antenna (scape + pedicel + 17 flagellomeres)...although the terminal segment seems to have 2 tiny subtly separated apical portions which I didn't count as separate segments.