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Hi Paul,
It might help if I used the right phrase!
I should have said pro-sternum (not post tergum - there is no such phrase). My memory let me down badly. I think pro-sternum refers to the abdominal segments that preceed the genitalia. However I am not really sure about this and it is a character that Roskozny uses quite frequently.

I will get the book out tonight and provide more accurate references.