To whom it may concern,

I'm not an expert on windscorpions (Solifugae). Was this collected in Contra Costa County? If so, I would consider a member of the subfamily Eremobatinae: http://bugguide.net/node/view/783828/bgpage

You may be able to identify your specimen to the species level with the help of a museum arachnologist at the California Academy of Sciences, UC Berkeley's Essig Museum, or UC Davis' Bohart Museum. You will need to call ahead and make an appointment at any of these mentioned. Best regards,

Andrew