Jeff,
Wondered if you might post the approximate locality of your observation along with the general weather and temperature conditions that has occurred the past few days leading up to you observation of the 6 SRBs.
The earliest day I arrived at the Arrowhead USFS Ranger Station was the evening of March 31, 1995 during my 5 year SRB study. That I immediately found a number of boas the next day indicated that suitable conditions had existed for some time before during March and the boas had been under surface objects well before I arrived.
If you could post that information I could copy it for my filed or you could send it to me at my e-mail address of charinabottae@earthlink.net
Thanks, Richard F. Hoyer