I had to look very carefully to both species, but I think yours is Synchlora gerularia. Note the typical, and in yours missing, dark apical margin on the forewing. Besides the spots at the other margins are slightly different as well.
http://mothphotographersgroup.msstate.edu/species.php?hodges=7060
http://www.discoverlife.org/mp/20q?search=Synchlora+gerularia
http://en.wikipedia.org/wiki/Synchlora_gerularia
http://www.mbarnes.force9.co.uk/belizemoths/images7/synger.htm
Xysteraria:
http://www.discoverlife.org/mp/20p?see=I_MPG19592&res=mx&flags=no_slide_show:
http://mothphotographersgroup.msstate.edu/species.php?hodges=7060
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