One or more setae on the most lateral part of the mesonotum immediately above the notopleuron base of the wing, so situated between the lateral margin of the mesonotum and (if present) the intra-alar setae.
Tried to attach an image to a forum post. jpg, 32kB, 72dpi, no blanks, ... File name is correctly displayed, but when I click "Preview Thread" it just vanishes. Help!