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We have had this discussion before (with a female Tabanus):
http://www.diptera.info/forum/viewthread.php?forum_id=5&thread_id=54882
When you say "stout" do you mean thick? Or short?
There are pictures on the web (some of the from this site) of "Tabanus glaucopis male" that look similar.
But anyway all my specimens are smaller than they should.
May be I can send them to you?
All the best anyway,
Rafael