Exoprosopa brevirostris (Bee Fly).
 
 
 
Photo: 06/26/11, 11 am.


A bee fly on a lantana flower. One of the bugguide experts identified it as Exoprosopa brevirostris (thanks!). I couldn't find much information on this fly but the species name means short beak. The genus has over 40 species in North America. According to Wikipedia there are >4,500 different bee-fly species worldwide. They are "one of the poorest known families of insects relative to its size". 
 
 
bug guide:
http://bugguide.net/node/view/535346
wikipedia:
http://en.wikipedia.org/wiki/Bombyliidae