I somehow are not really convinced this, and praetorius, are two species.
Here: http://www.cerambycoidea.com/forum/topic.asp?TOPIC_ID=18116
a specialist said, difference is in the amount of black colour on pronotum.
To me it seems, your specimen above is an intergrade between 2) and 3).
1) praetorius all orange:
http://plant.cdfa.ca.gov/byciddb/wdetails.asp?id=32400&w=o
2) small spots:
http://www.projectnoah.org/spottings/366053527
3) banded:
http://plant.cdfa.ca.gov/byciddb/wdetails.asp?id=32404&w=o
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