Wonderful pictures!
The first one is a
Chrysura sp. and the second a
Chrysis sp., but I dont recognise the species.
The third is a male
Chrysis sp. in the
ignita-complex, so getting to species level will probably be hard, although with those long teeth on the T-3
C. ignita (s.s.) comes to mind.
The last picture looks a lot like
Stilbum calens to me, with the ocellar carina being well separated from the compound eyes (its much closer in
S. cyanurum), metasoma finely punctated dorsally and the dark red on T-2.
But I'm sure Paolo will come by and correct me, and give you better ID's of the first two specimens
/Alex