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It's a pity there is no specimen ... especially since you had good details of the host :( Tachinid + host data is very useful to help us understand what these insects do and what they depend on. If you can take a specimen I would be very interested to identify them for you - especially if they have host data. ;)

To me it looks like 1 anterodorsal (forward-outer) bristle on the mid tibia - the bristle on the end of the tibia are called 'spurs'. :)