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The additional pics clearly show male intermedia. Nice work.

As for your other question:

you are quite right and it is annoying.

For instance, the usage of ‘ apical, subapical lateral, subbasal’. and even ‘ second lateral’. for bristles on the scutellar margin is actually undefined. If there are only three pairs, is the middle one subbasal, lateral, subapical .... ???
It would be better to just give the number and, if necessary, describe the position of its base.

Now, returning to your question:

Yes, but this problem only occurs in Cylindromyia (in Tachinidae).
Moreover, there is no such thing as far as I know as a discal tergal bristle without a marginal tergal birstles.

Therefore
-1) it is still useful to use ‘ discal’ in Tachinidae context
-2) it is clear that in Cylindromyia we are dealing with advanced marginals.

By the way, the degree of advanceness is species specific !



Theo