This is a fairly typical tachinid but has been extracted from the others by a similar trait for a flattened abdomen with very distinctive male genitalia, clearly visible underneath.
EDIT (Monty Wood 26/9/2010): These are all clearly Masiphya sp. males, with the very characteristic male genitalia and pale Sturmia-spot. This taxon is slightly unusual in that it has a very small separation between the mouth edge and the vibrissae, while ‘normal’ species are often characterized by having a wide gap. They are parasitoids of mantids.