Wasp

Thanks Luis Vivas. Precisely why I tried to seek more help since I have doubts regarding the first ID suggestion of S. caementarium.

Well, I think it's sure genus Sceliphron, but I don't believe to be S. caementarium.
See this photos of S. caementarium (from Europe):
http://www.galerie-insecte.org/galerie/s...
You can see it has black pendunculum and yellow propondeum, different colors at this specimen, very similar to S. spirifex, but I don't know if this species is found in the region where this photo was taken.
Ciao!!

Thanks Daniela

Nice series Jolly!