This taxon is very similar to taxon #45 but larger in size. Note the very broad, shallow scutellum with distinctive row of scutellar bristles, combined with golden thoracic dusting and a shiny abdomen.
They look superficially like Tachina spp. in Europe but they have a projecting mouth edge and quite a few other disimilarities.
EDIT (Monty Wood 26/9/2010): These are all Jurinia sp. – a common and highly speciose genus characterised by having single pairs of median discals and median marginals on T3 & T4.