Determination by myself & Monty Wood.
This is another interesting “pair” of tachinids – the first being Jurinella lutzi (caught New Mexico, USA) and the second is a specimen caught in Ecuador (Napo, rio Hollin, 1350m ASL) by Andrew Neild. The second specimen keys well to Jurinella in the Nearctic Manual and, although the thoracic colouration and the arrangement of median discals is different, I believe that it must at least be closely related to Jurinella.
This is another Tachina look-alike but with a projecting mouth edge, like Linnaemya.
EDIT (Monty Wood 26/9/2010): This group contains 3 spp. of Archytas and 1 spp. of Jurinella. The photo shows one of the Archytas sp.: