Thanks for all the help bayucca! I'm going with Stictia signata based on your linked pictures and this one. http://www.flickr.com/photos/miguel1pr/6523350411/
Also this page describes them from Guyana. http://books.google.com/books?id=FExMjuRhjpIC&pg=PA541&lpg=PA541&dq=Stictia+signata&source=bl&ots=bDsIZdTvED&sig=AlYnvqtf_Le_lZQbalNDkff_Bzg&hl=en&sa=X&ei=IbNxUcaFO66u0AGV6YDACQ&ved=0CEMQ6AEwBA#v=onepage&q=Stictia%20signata&f=false
Actually I have no IDeas of wasps ;-), but I found some interesting name to check...
Stictia signata:
http://www.flickr.com/photos/42068060@N06/4826851409/
http://www.natureonstatia.com/Stictia%20signata1.jpg
http://www.boldsystems.org/index.php/Taxbrowser_Taxonpage?taxid=95812
Probably the same one as yours?? Stictia? Bembix? For me rather Stictia...
http://www.backyardnature.net/yucatan/sandwasp.htm
http://www.shnlh.org/galerie_photos/picture.php?/1252/tags/1-guadeloupe
http://3.bp.blogspot.com/-lamtF02tNRA/UH6G3KwTA3I/AAAAAAAAB0E/131YWbF_IbM/s1600/Stictia-signata.png
Bembix americana??
http://www.flickr.com/photos/42068060@N06/4827460580/
http://bugguide.net/node/view/79847/bgpage
http://commons.wikimedia.org/wiki/File:Bembix_americana,_female_2_BIML_USGS.jpg
Just some IDeas before going to the apéro ;-)...
Good luck!
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