Acanthocephala declivis--as I manipulated it on a craft foam stage, it would occasionally tilt one side of its body up in this fashion. I got a whiff and realized it was presenting its defensive scent gland to me. The inset shows full detail from the same frame. The odor was strongly aromatic, but not really unpleasant.
I'll get around to posting the rest of my photos from my Ash Ranges visit, but after a comment on Libby's lovely site photo, I thought I would share a favourite: my first alydid and the only one found in Britain, Alydus calcaratus.It was a nice warm day when we visited and I thought this was a wasp at first because it was flying around. We potted it up and bagged it for a while in the hope it would cool down enough to stay still for a photo!
Found at the Martin Luther King Jr. Recreation Center (32.701312, -117.060754) on a tree. Brown / black in color. Like to be in sunny places for warmth during fall and winter. This observation is part of the High Tech High Insects of San Diego Field Guide.