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Thasus sp.
Some species of Thasus, pretty big- the upper abdomen has an amazing orange color only visible in flight- sadly I couldn´t capture it.
All the nymphs I've seen are exactly like the one in the third link. I've seen adults of two species, tho- the bigger ones are more colorful and don´t seem to produce that sharpie-smelling fluid when caught, unlike the smaller ones.
There are several species in your area as you already mentioned. The nymphs are usually and depending on the stage of instar all colorful. I think they would more vary during their instar compared to the variability within the genus. I would have to see the nymphs separately. Nymphs are usually not easy to ID.
https://www.flickr.com/photos/apollo_mus...
https://www.flickr.com/photos/miguelange...
https://www.flickr.com/photos/carlos_man...
https://www.flickr.com/photos/carlos_man...
http://www.pinterest.com/pin/38752074290...
http://johnbokma.com/mexit/2010/06/07/le...
http://www.alexanderwild.com/keyword/apo...
Do the nymphs of T. neocalifornicus vary, color-wise, according to region? There's photos online of nymphs that look a lot like the ones I see here but with entirely different color schemes, and the ones I've seen are variously labeled as T. neocalifornicus, gigas or acutangulus... :(
Coreidae, Coreinae, Thasus neocalifornicus.
http://bugguide.net/node/view/862618
http://www.alexanderwild.com/Insects/Ins...
http://bugguide.net/node/view/309498
http://bugguide.net/node/view/20163