Here's what Flower Flies of Los Angeles County book has to say about them:
"This is the largest flower fly in Southern California, with a body length of 18mm. It gets its name from the larvae that feed in wet decaying prickly pear...
Photos of the bug taken by Inna Strazhnik:
But that's not...
Quick Dragonfly Update!
I've documented another dragonfly visiting our pond. It was a Black Saddlebags, Tramea lacerata. My phone's camera couldn't capture a picture of this fast-flying critter, but I was able to send myself an e-mail documenting the find. Here's the e-mail:
"Saw a saddlebags by pond
August 22, 2012
This brings our total number of dragonflies and damselflies to six species! Check out this recent post to see the the other five.