Eriophora ravilla (Tropical Orb Weaver).
 
 
 
Photo: 06/20/15, noon.


Tropical Orb Weavers can show a great variety of colors and patterns, although many are dull brown. This one features a number of bright pigment spots that create a cross-like pattern. The species is mainly found along the Gulf coast. 
 
 
bug guide (this photo):
http://bugguide.net/node/view/1087367
H. W. Levi (article):
http://www.bio-nica.info/Biblioteca/Levi1970Araneidae.pdf