I'm thinking this is Mecaphesa asperata. The distinct dark red banding along the lateral edges of the abdomen is often found in that species and is mentioned by Gertsch ("the sides with out without a red band"), but he doesn't mentioned this feature for Misumenops bellulus. Both the M. bellullus in the photos I submitted and a specimen collected by friends and confirmed by GB Edwards showed a "bleeding" together of the colors of the abdominal pattern along the sides, but there was no distinct solid band as on the Palm Beach County spider. That spider also showed in the anterior portion of the abdominal pattern somewhat of the "T" mark pointed out by Joe Lapp as indicative of asperata. But it will probably require the photographing of many more specimens of the two species--identified by genitalic examination--to confirm whether the features mentioned above prove to be reliable "in the field" for separating them.

some down in Florida are still in the genus Misumenops! Good catch.