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In the 9/8 measure at rehearsal 41 that immediately follows a 12/8 measure in both tuba parts, the 8th notes are barred 4 + 1.

Does this imply hemiola for the sake of the players' internalization of counting, note emphasis, forward motion, etc.? Or is it merely an oversight/convenience of the editor/publisher (one wouldn't think so)? Or is this too much detail with which to be bothered at this tempo (then why notate it this way when the previous measure's cues have 8th notes grouped in 3's)?

Every time I've played this piece that measure (and the following) has been conducted 2+2+2+3 with the 8th note staying the same as the 12/8 previous bars. You might want to check me on this, but I believe the score notes it as 4/8 + 5/8.....now that you know this, a quick listen to a recording should make it very clear.

So to answer your question: yes, it is a hemiola.

Have Fun! This is one of those rare pieces where both tuba parts are a blast to play.

James