or Cuterebra buccata seems to be the species. Article here http://entomology.unl.edu/lgh/ent108/BOTW/BOTW3_rabbit_botfly.html.

Frank Slansky is an entomologist at the U. of Florida who has studied botflies, and how their larvae invade the tissue of tree squirrels.
More information here:
http://botfly.ifas.ufl.edu/index.htm
You might also e-mail your image to him: fslansky@ufl.edu

I recommend reading: Slansky,F., Kenyon,L.R. BOT FLY (DIPTERA: CUTEREBRIDAE) INFESTATION OF NEST-BOUND EASTERN GRAY SQUIRRELS
Florida Entomologist 2002 85:369-371

Just notice there's an image (#20765) on this site with a remark by Eric Eaton about the calypters, the 'wing stubs' to which you refer.
Insects of the Los Angeles Basin by Charles Hogue also includes a family description.

I get a feeling of déja vue glancing at these images. Bot Fly, perhaps even genus Cuterebra, family Cuterebridae (ITIS: Oestridae, bot flies, or warble flies), and a cold shiver down my spine at the thought of how these insects make their living. It also reminds me that nature knows neither beauty nor ugliness, neither good nor bad; it just is, and offers infinite variety to ponder.
I think your photos of this insect are great! Someone else may want to describe their life and habitat. I just had a late night dinner! BioOne (bioone.org) has a good brief article, and you'll find much more on the net.